Separate dongle for internet using a hotspot can help. No system is perfect but Linux phone is an excellent first step

You’d want to be using only Linux apps that weren’t recording and reporting everything. Much easier to get in Linux than Apple/android

Somebody was working on one but not sure it’s live any more https://github.com/Flockingbird

I succeeded using linkding which I’m hosting on pikapods https://github.com/sissbruecker/linkding https://pikapods.com/