You quite possibly hit the nail on the head. Sometimes, far too often, random people doing nothing underhanded become a false positive statistic for some sort of automated malicious activity detection and have their accounts suspended for no good reason.

But other times, those automated malicious activity detectors are doing their job correctly, and people really ARE doing something underhanded, and the giant corporation in question chooses not to air their reasoning in public, which is probably the right call (from the corporation's perspective) most of the time. It's hard to know from the outside which one of those two things happened.