I understand as I've been unfairly blocked from people's DeviantArt pages many
One time a guy blocked me, and began talking schmitz behind my back on DA, and because I was "blocked" I couldn't defend myself from him trying to spread false information that I was a "troll," because I couldn't access his DA page, nor even respond to his comments outside of it. I reported it to DA admins, (with links to his comments) they just told me to block him back, which would've helped nothing.
Most recently, a Sonic fan whom was posting false information about Sega, & Sonic comic writer Ian Flynn, and insisting the SonAmy 'ship was "canon," and such. Apparently, anyone disagreeing is a "block" offense as far as they're concerned.
You'd be surprised how many times I was blocked just for disagreeing politely.