In my youth the only place I hung around on besides here was RuneScape. I originally quit in 2012 right before they rolled out the precursor to RS3, because the updates were getting really stupid and everyone was leaving over the disconnect.
Came back under that account a few months after they launched OSRS, and played for a while with a membership and all. I did some real-world trading to get the items I never managed to afford on my old account, even though skills didn't carry over so I couldn't wear them yet.
After my subscription lapsed and I canceled it once and for all, I got an email from Jagex saying they banned me for RWT, which I kind of expected. The weird part was, I did it quite a while before canceling my subscription, and they didn't care until I dropped into an inactive state with no membership and all.
Above everything else, the email was really threateningly rude and unprofessional. Chock full of empty legal threats to the tune of civil litigation and extradition, and I'm like haha yeah not in a million years are you going to extradite me for some civil suit in the UK. They could have done better than that.
I registered again years later and used OSBuddy along with a new membership, but I can't play it at all. It's the epitome of grinding.