Various websites suck in one browser or the other or simply don’t work in more than one single browser. We’re not that far away from the days when Internet Explorer (IE) was the only thing that loaded a site (often for something work-related… groan)
That said, if you need Chrom(e/ium) and want a non-data-sucking version, I think Ungoogled Chromium is your best bet currently.
For the Firefox side of things, there are already several forks that aim to do things differently/better. Floorp is one I see recommended regularly. There seem to be a larger number of Firefox forks focusing on security/privacy than Google forks, but this is the most well-regarded from my research.
Simultaneous post-enshittification from both Chrome/Chromium and Firefox is probably (hopefully) leading towards more active development/contribution to these (and other) forks!
This sounds like schizophrenia to me. Particularly the weirdness and occasional paranoia. There’s no agreement on the causes of it, as far as I know. Whether AI can either cause it or push someone over the edge, I have no clue.
My brother has schizophrenia and is one of the most technologically inept people I know - both before the symptoms and currently. It is known to have existed well before modern computers.
Also worth noting that schizophrenia onset usually occurs in adulthood with and average age between late teens and early 30s. Later onset is less common, but known to occur.