Edit 2: Some information on rules in blocking. [link]
There are also rumors going around to the effect of
"So dA is banning those who respond to people who block, unblock, comment and then block. Yes, even though they've unblocked you, do not respond to their comments. They can report you for evading block, even though they unblocked you. So, to remedy this, block them back. If you find someone who has blocked you, then block them."
Since it was not addressed in the journal above, for now, it is just rumors. I would listen to that, just in case.
EDIT: "PLEASE NOTE: Using alternative accounts to contact people who have blocked you on another account is considered harassment and can result in all your deviantART accounts being suspended or permanently banned." FAQ #96:Can I block people from my profile page?
I was blocked by two people for very stupid reasons. I was just commenting on their work like "nice job" and giving them critiques all the time and stuff like that. And then, one day, one of them blocked me, and then the other did. It was annoying as fukkk