I thought about using OpenVPN for piracy, since it’s open source and can be easily set up on Arch Linux. Does anyone know about the quality of it or if I should use another VPN?
Openvpn is a protocol that other vpns can use, the speed and quality would still depend on what provider you use. A provider would provide a config file that would include all the info required by openvpn to create the connection, as long as they include that then you could use openvpn.
Most providers offer both openVPN and wireguard where latter is better afaik. What you want for safe sailing is kill switch. When something goes wrong you dont want your home IP to leak, and kill switch will make sure you are disconnected instead of using home IP.
So if you get AirVPN for example, download their client called Eddie and look for kill switch option (called network lock). Other clients might have different name, some might not have that feature at all and some might have crappy kill switch.
What I use is qbittorrent in docker container hidden behind VPN in gluetun container (most recommended setup afaik)
That is needlessly complicated. Just force qbittorrent to only use your VPN network interface and you don’t need any of that: https://lifehacker.com/you-should-really-bind-your-vpn-to-your-torrent-client-1849779407
This has the advantage of giving you the “kill switch” feature without having to download your VPN’s proprietary app. It works with Wireguard, OpenVPN, whatever. Qbittorrent is actually one of the few clients that has this feature, one of the reasons it’s so widely recommended.