he's referring to the fact that almost all browsers use chrome's rendering engine and google is abusing its position of leadership by making unnecessary api changes that make adblocking extensions all but impossible to implement.

if you want to still be able to block ads on the web in the years to come, switch to a non-chrome web browser to limit google's power and ability to abuse its position.

i think as of now, they have delayed the sabotage, but it's coming.

https://arstechnica.com/gadgets/2022/12/chrome-delays-plan-to-limit-ad-blockers-new-timeline-coming-in-march/

Not entirely sure what the commenter was referring to, but it might be about tracking (Firefox has great anti-tracking and privacy tech). The real money on the web comes from ads, and specifically targeted ads. Targeted ads require that advertisement companies like Facebook and Google track you and build a profile based on your activity. Companies like reddit make money by helping to build these profiles and by delivering ads.

If you can still be targeted by ads, the powers that be will continue to try and "make a buck" off the internet. If there is a market for targeted ads, it is likely that a service will be monetized for the sake of profit, which typically leads to situations like what we've seen with reddit, Twitter, Facebook, etc... Privacy is essentially an ad-business killer in the modern web.

Usually you can install/update Firefox (see Portable firefox)

Chrome is proprietary software, so nobody can verify what it really does on your computer. Google also wants to kill adblockers.