This seems like a case of someone going out of their way to get morally outraged. The argument is that sites want to be able to censor comments made about their content on a third party platform. How is this any different than censoring comments made here or on Reddit?
So because I'm a shitlord I keep losing track of what the current orthodoxy is, but apparently MiSTing counts as "harassment and abuse". Got it. I'll keep that in mind.