Yesterday I was runnig Tails and obviously using tor. The point is that some subreddits doesn't allowed me to access, showing a 503 message. After a moment, the message appeared in general. Right now using tor on Debian, I'd tried to open the same posts and everything just worked fine. I found this guy experiencing something similar
So the question is Why this is happening? I thought tor is the same for Tails, Debian or whatever distro you are using.