I just tested it with PIA (not an endorsement, I bought five years back when it was good and didn’t know about mulvad) and it worked. They might just be blocking specific ones or something.
On Mullvad, I've found that servers beginning with a certain number are usually not blocked. Not saying the exact number so that it stays semi-secret, if it is even a secret.
Basically, a whole set of x** seems to be unblocked, where x is a number. So the 100s, 200s, 300s, 400s, or 500s. Try it out! Or DM me and I'll just say the range.
If you are signed in you can access reddit via a VPN. If you're signed out you get that smug snew image. Its not just reddit either: Instagram, twitter, Facebook, all fuck with you if you arrive via a VPN IP Address. Insta will say there is an error. Twitter redirects you to login. Facebook will just ban your account. Reddit I think will also ban your account if you're even remotely "bad".
You gotta make your own VPN by installing a ras-pi in the drop ceiling of a bathroom somewhere with free Wi-Fi, alligator clips on the lights for power.
I'm on Mullvad and this happens with every country available except for the UK servers. I usually just use Libredirect though because redlib still works with VPN.