P2p is the way the web naturally flowed, protocols like bittorrent wore able to distribute content better than giant streaming companies without relying on giant infrastructure.

Now sharing is frowed upon, hosting your own server at home is frowed upon, the web used to be more made by users, now to do anything you need to go through a big company.

The difficulties you face on piracy is just a reflection of how capitalism is fucking the web.

Not exactly a piracy tool, but syncthing is quite useful to keep pc and other devices in parity if you don’t plan to leave one on all the time.

You didn’t mention gaming, but if you plan to use your tablet for emulators, you can sync save files with it if the emulators are compatible cross pc and android like ppsspp.

To be fair, nowadays malware behavior is more likely to come from the companies than the cracks.

Curators are a good way too, some blogs or podcasts do a lot of heavy lifting in discovering new shows, some communities with similar tastes are also good to find content, way better than algos and ads.

Doesn’t have offline support, but it’s easy to setup, ytmusic vanced on mobile with ytmusic with ublock origin on desktop.