It's a well known scientific fact that higher frequency waves carry more energy. For larger mammals, such as humans, these differences are trivial for the most part. Unless you're standing in a location which is exposed to high amplitude and high frequency EM waves, the danger is generally nil. By high frequency, I'm talking about pretty much anything over ~10Mhz, and for high amplitude, I'm talking about power levels at or above 100W. Putting 100+W of power through an antenna is extremely rare, and due to things like attenuation, free space path loss, reflections, refractions, etc, unless you're basically standing directly next to an antenna, in its transmission path, you're fine. Bluntly, this is why cellular towers are set up the way they are. Usually an antenna mast will have a relatively small support pillar of some sort, usually a cylindrical "pipe" shape, or a set of support beams in an overlapping "x" shape, which narrows as it goes up. At the top it usually flares out for where the antennas are mounted, so if you climb up the mast, you end up behind the "business end" of the antennas; aka, they're pointed away from you. This means that the vast majority of energy being produced is directed away from where you are. For everyone else, being on the ground or even in a nearby building, you're too far away to be exposed to significant signal amplitude. We can it EIRP in the industry, or "estimated isotopically radiated power". The EIRP drops off quickly in the first few meters after the antenna, as the signal expands outwards towards the service area; so even being within 15m is generally safe.

EM waves can be dangerous, specifically in the extremely high bands; IMO, this is what scares people. Extreme high band EM is dangerous at most power levels. These extreme high bands are capable of causing damage at the cellular level, possibly causing your DNA to break down. These are referred to as "ionising". The bands that people most commonly know that are ionising, includes UV and X-ray. High band UV 2 and UV 3 are in this range, and x-rays are too. They're all EM waves and they are extremely dangerous. These are all emitted by our sun, and mostly blocked by ozone. Some small levels of UV 3 might get through (hello skin cancer). What I want to point out is that these are all at, or above hundreds of terahertz in frequency. UV bands start around 800Thz. 80,000 times higher than 10Ghz. It goes up from there.

Light, which is also an EM wave is between 400-800Thz, and it's widely considered harmless. Yet, common folks tend to start to freak out about EM above ~6 GHz because of a lack of understanding. 8Ghz is more than 100,000 times lower than the low band of UV (which is non-ionising). Any EM wave with sufficiently high transmission power is strong enough to cause damage, for most frequencies below 400Thz (aka, below visible light) would need to be significantly higher than what we normally use. For context, transmission power at the antenna for broadcast radio (eg FM radio stations), is usually around 100kW maximum per antenna system. These transmitters can be legally and safely placed in urban areas provided adequate separation between the antenna and the public, usually 30-40 meters. To contrast this, the broadcast power of WiFi at 2.4Ghz is usually set at or around 100mW (0.1W), with a maximum output of around 1W (legally at least). To further this example, microwave ovens use 2.45Ghz frequency EM to heat your food. This is usually combined with a very well insulated cage to prevent that energy from escaping, which both protects you and your home from being cooked, and also directs the energy towards the item being heated, improving efficiency. Most modern microwaves can emit around 1000W (or 1kW) of power. 2.45Ghz is, however, special, in the way that it directly interacts with water. This specific frequency can excite water on a molecular level to create heat. I won't go much further into it than that. So it's unique in the interaction it has. Something something resonant frequencies something something.... Look into it if you're curious. The point is that your 2.4 GHz WiFi is 1000-10000 times less powerful than your microwave. Other frequencies do not have the same effect on water or other molecules. If your microwave ended up emitting 3Ghz instead of 2.45ghz, you would have a microwave that consumes a lot of power, which doesn't do anything useful.

I mention this to point out that the amount of power needed to affect something in favorable conditions is generally at or above ~800W of transmission power, in the equivalent of an EM "mirror" box. Consumer goods generally will never transmit above 1W. Even at 0.1W you can usually saturate your house, your yard, and your neighbors yard.... At least enough to "see" the signal.

"5G" and "6G" mobile/cellular technologies operate in the gigantic band between 900MHz and 400THz (often on the lower side of that very broad range), well below the level of ionizing EM, and at power levels well below what would be dangerous. The largest 5G arrays run with power levels around 120W. Which is less than 1/8th the power of your microwave, and at a maximum of 40Ghz, well below ionising.

Scientifically speaking, 5G mobile carrier antennas are less dangerous than walking under a 1000W flood light, which people do without hesitation, or even a thought given to any possible danger from the exposure to the ~600Thz EM being emitted by the floodlight.

Bluntly speaking, it's a stupid argument to be afraid of 5G for the transmissions themselves. You will not be harmed by them.

Regarding everything previous to your mention of Snowden – No. Simply no. We've already done exhaustive research, 5G isn't even close to a high enough frequency