Calling him a cuck because Anisa has an OnlyFans is chud behavior. However, it's a lot more than that. The OnlyFans thing is probably what got the most publicity, but that's really not a big deal if they're both fine with it.
What is a slightly bigger deal, and the main reason people still bring that term out, is the repeated pattern of disrespect that has publicly worn Ian down for years. Events such as:
-Anisa making him miss Max's wedding because she had an appointment to get a tattoo.
-Anisa saying his style is "trailer trash" on a podcast, and of course expanding when given the chance.
-Anisa making fun of his chronic IBS on stream when he was obviously uncomfortable.
-Anisa making him change his last name because "his last name is objectively ugly."
-Anisa making fun of his body before Creator Clash.
-Anisa filming Ian struggling with a respiratory injury and fractured shins before Creator Clash for content, and urging him to fight anyway.
-Anisa talking about how he would have lost Creator Clash in the end anyway after.
-and more!
Normally, I would write all that off as banter between a couple that regularly ribs each other, but iDubbbz clearly looks so uncomfortable during all of these moments where he's onscreen and he does not "joke" back with Anisa either.
Granted, namecalling does nothing to help Ian. He clearly needs a wakeup call for his self-worth. However, classic iDubbbz fans are not known for their eloquence, and Anisa's repeated devaluation of the guy and his life, combined with his seeming willingness to just sit there and take it, have kept the "iCuckz" moniker alive long past the OnlyFans drama.
Just my two cents. I've been thinking about the iDubbbz "downfall" lately. He was super right to pivot audiences and content, he just seems like he might have lost himself a little. I just wonder sometimes about what it would be like if iDubbbz pivoted left but kept that same brutal knack for surgically dismantling someone that's being a piece of shit. That's what I expected from the H3 Content Cop, and that was just regular-ass YouTube drama.