Which free VPNs are supported by gluetun?

I want to try bitmagnet on the dev server at work (yes, we have permission to use it for personal reasons as long it's legal) but for obvious reasons it must be tunneled through a VPN.

Bitmagnet it's a local search engine that discovers content via DHT. It just asks peers for content, then when you come back the following month it should have found many interesting stuff

Problem is that from a network point of view it looks I want to download every single torrent ever made so I wouldn't want to have my workplace ip address associated with that.

Because the network traffic is minimal and for this content I don't care if the provider does data mining, I would like to use a free VPN with gluetun.

But I can't find a free one that works. From the officially supported only windscribe and proton have a free offer, but windscribe free doesn't have OpenVPN or wireguard, while proton VPN free blocks me immediately as soon as the program talks with other peers, even if I don't actually download anything.

So back to the question, which free VPNs are working with gluetun, someone has experience with that?