So if you see this as just a new feature that provides some on-device AI, it's a bit, so what? A new feature? The last GT7 or Flight Sim patch was bigger than this, what's the big deal, etc.
However, that's not really what's going on. It theory Chrome gives you a local LLM that can provide local AI powered features. In practice, everything gets sent to the cloud anyway so the local LLM seems mostly to exist as a disguise for that, which is shady AF.
As others have pointed out, the solution is https://www.firefox.com/. And whilst it's been trendy on HN for several years to slag off Firefox and Mozilla, I went back to Firefox as my daily driver several years ago, and Chrome's high-handed enforcement of Manifest V3 extensions (meaning no full fat uBlock Origin) has only served to cement that decision.
It's mostly been great. The only downside is that some sites don't work properly on Firefox, and I'm 99.999% sure that's not Firefox's fault.
For example, Paypal's post-login verification step breaks so every time I want to buy something using Paypal I have to switch to Chrome. And, no, disabling uBlock Origin and other extensions on Paypal doesn't help - I've done this already. Seriously, Paypal, it's been months: will you please just fix signing in and paying on Firefox, please?
And many sites will assume you're a bot first and ask questions later if you hit them with anything other than Chrome or Safari... which is also extremely lame and scummy.