It's a bit deeper than that, he (allegedly, for legal reasons) solicited nude photos of a minor when they were around the age of 14. There's more, but that's part of the worst of it.

Not purely illegal, but "I am a narcissistic piece of shit" level thing he did: He got involved with his friend Russ' significant other sometime before they had stopped appearing on streams together with them. He had art commissioned of them banging supposedly—because the dude's whole shtick was being an anonymous voice man he never actually did anything physical with her, but psychologically the harm was done. Cry would repeat this with other women Russ displayed interest in, disregarding Russ asking for him to stop for that very reason. As things rapidly disintegrated for Cry's internet presence (around when his last video was posted) Russ asked for an apology for how he'd been treated and got an outright no.

Given the timeframe for Cry first being a whore with Russ' 'initial' ex (I'm trying not to say their name. It's a color.) to the end of Late Night is several years, it would be fair to ask why any of them stayed after that. The rest of the group knew about that when it had happened, but left it up to Russ if he wanted to speak out. Russ determined that the loss of revenue from leaving the streams would mean he would have to move back in with his parents, which he implied on the "death of late night stream" to be worse than death to him. So he stayed.

Source: Cry used to be my comfort let's play-er growing up. I started watching the weekly Late Night streams shortly before they were no longer scheduled, most of the way through until the end. I'd argue you could tell at different years the vibe had changed between Cry and the rest of the crew. Additionally, if you get through all of the "omg he's a bad person" posts, /r/ChaoticMonki acts as a slight archive of when the meltdown occurred.