+1 for Syncthing

Termux has been a thing for years.

privacy these days is really hard to achieve

Which is exactly why claims like this should be backed with evidence.

Unsourced claims like this do absolutely no good to anyone, ever. Which means that either right before typing this comment, you though to yourself “time to be a bad person for no good reason” or you’re a shill for some surveillance agency with an interest in scaring people away from privacy enhancing solutions.