I brought this up to Huffman (u/spez) during ModWorld and followed up with him later. The mods on r/pics have been on a pre-emptive banning spree lately. The issue is on his radar now at least.
Cool! just reviewing my comments. Thanks for bringing it up. A simple "you are banned from posting notice" after trying to post would be all it takes. If I'm banned from a sub, then don't let me post there. It shouldn't let vindictive, power hungry mods permaban you from reddit because you "ignored a ban".