Not that contagious, I'm afraid.
My boss uses Reddit some. I'm banned. At the shop, we use the same IP address (and we do not use ipv6 there).
I tried to log in with a ~10-year-old account that I'd never commented with. A perfect Beetlejuicing moment had arrived and I just wanted to play the game with a short, snarky comment.
It logged in fine, and then: Insta-ban, just like that. (Maybe I should have used a new browser on a new network that I've never used before, but whatever -- nothing of value was lost here.)
Meanwhile, the boss man's access continued unimpeded; this suggests that it is a rather targeted contagion.
And it seems to follow the systems, not the networks.
(If anyone wants banned, just let me know. I seem to have a well-poisoned system to play with.)