Is torrenting allowed with a VPN?
Using a VPN while torrenting is legal, but it does not change what you download. Downloading copyrighted material without permission stays illegal, VPN or not. For legitimate P2P traffic, like Linux distributions, most services offer dedicated servers.
Copyright law applies regardless of the tunnel your traffic travels through, and with torrents you are typically uploading to others while you download, which is distribution. A VPN hides your IP address; it does not change the legality of the act, and you remain responsible for what you do.
There is also plenty of legitimate P2P traffic: Linux distributions, open source software, and content creators distribute freely themselves. For that, VPN services with P2P servers are perfectly suitable, and the encryption stops your ISP from throttling P2P traffic. Mullvad and Private Internet Access are popular in that corner; NordVPN runs dedicated P2P servers.
If you do use P2P, enable the kill switch: it is precisely during long downloads that a brief VPN drop would otherwise expose your real IP address.