The nonsense steps to even get there. The absolute nonsensical mess of lies in their claims to even do this in the first place. Lets be clear - if they wanted to block malware, they would need to be doing so from the Play store in the first place. So, lets highlight a few simple things:

• It was only about 6 months ago that it was documented by a cybersec company that hundreds of malicious apps were downloaded quite literally tens of millions of times.
• The number of malicious apps on the Play store have gone up, not down.
• Banking malware has more than doubled in the past few years
• The majority of growth (more than doubling) in the YoY were spyware apps - used for identity theft, extortion, and surveillance, and all on the Play store.
• There are even ones specifically targeting Android TV boxes, again mostly operating unchecked on the Play store.

To even suggest installing apps (which, lets be honest, that is what they are calling "sideloading" - doing the thing you do on your PC all the time) from a different location is the issue is far from reality. So any "promise" from them is worth functionally nothing to me.

As I said, I'm leaving Android either way. I shouldn't have to go through such a massive number of hoops to install on my own device.

Enable Wireless debugging

not everyone has wifi at home, and this doesn't work without one. It's also very complicated for people. it is basically a wall around a garden.

also you either have to set adb over wifi to automatically turn on when connecting to that wifi, which is not that safe, or turn it on manually every time you want to install apps or updates. with that, the recent android feature to allow 3rd party stores to update their apps without a prompt goes out the window.