Could also mean those doing the banning get their panties in a wad way too easily... or you posted on an entirely different subreddit they didnt like... or just because.
Up to you. If a website bans me for a "super shitty reason" I think I would just not engage with that website. There are several others to go to, dozens even.
Chances are you have an ISP that is doing dynamic IP. Clear cookies and cache on everything you ever touched Reddit with, note what your current IP is (Google "what's my IP address"), unplug your ISP modem for about 15-20 minutes and plug it back in. You should get a new IP, check with the Google trick again.
Might get tricky if Reddit does something like a hardware ID on your computer or something, but I doubt it.