If Steam ever fucks over consumers I will pirate 100% of my games from that day on unless an indie company allows me to buy directly from them or through GoG.
Windows 10 and 11 LTSC are slimmed down, official versions of Windows that can be downloaded from links found here. An activator with instructions can be found from the same source.
If you really can't switch to Linux, then use what works. There are multiple ways of cutting down on telemetry as well. O&O Shutup 10++ is a very good starting point.
There are multiple. There's Voyager, also available as a PWA if you want to stick to using your browser. I personally use Thunder most days.
The "official" app, made by the main lemmy dev is Jerboa, but like most first party fediverse apps, it's barebones compared to third party offerings.
ETA:
I'm on Android. Don't really know about iPhone options.