> Bitcoin miner,

Doesn't matter so much about Bandwidth, That friend knows nothing. You'd need more processing power that offsets the extra bandwidth.

You could try a Seedbox. Easy to setup, cheap.

https://distrowatch.com/dwres.php?resource=bittorrent

other things include

https://geti2p.net/en/

https://en.wikipedia.org/wiki/Anonymous_P2P

https://en.wikipedia.org/wiki/Lantern_(software)

Setup any number of Game Servers....

https://github.com/OpenRA/OpenRA/wiki/Dedicated

But first invest in a good router.... Or setup a Homelab

https://www.reddit.com/r/homelab/

VPN/Proxy Server for family and friends

Plex Server for family and Friends.