Not a VPN, but you may also want to look into I2P.
https://proprivacy.com/privacy-service/guides/i2p-guide
https://youtube.com/watch?v=FNp0TRDG0BQ
Basically, a p2p protocol for the entire internet.
Its considerably more complicated to set up than most modern VPNs, where nowaday's its usually as simple as install an app with a GUI, verify some settings and you're good to go, and i2p is also quite slow...
... but its totally free, and you can torrent over it, and as far as I know, if you've set it up properly, it is basically undetectable by ISPs, due to how it uses 'garlic' routing: basically, a whole bunch of users net requests are encrypted, anonymized, and then smashed into a big packet... so an ISP would have to untangle all of that for every packet, and afaik, none of them have figured out how.
I2P would obviously be horrible for watching streaming content though, snail speed.