I’m using Proton VPN all the time with Reddit, servers from all over the world: Europe, Asia, Africa. I have 365 day streak achievement on day 320 today, so at least those past 320 days I’ve been using Reddit with Proton VPN every day (I also have killswitch permanently enabled). Also used two other lesser known providers years ago with no issues. Keep in mind though, I’m only ever using paid servers. Wouldn’t surprise me if those few free ones are banned everywhere. It takes one user to misbehave from IP to get that IP banned.