I think better alternative will be to have AI Scan any Post in Question or Written Review, it would be best way in my opinion to counter Harassment/Abuse or to differentiate between bullying and actual question. Nowdays AI is Pretty much competent for such task. + Option to Toggle Question/Answer Section by Seller (Just like youtube comments).
Now little Offtopic, I think the primary reason for removal of written reviews and Q/A is regarding Child Protection (I don’t know from what or why, maybe there are regulations?) rather then Harassment or Discord Abuse. Just like comments are Auto Off on Youtube Kid Video.
They are trying there best to remove all sort of un moderated user input content from there platform where kids are involved.
In my opinion Fab is solely launch to milk kids because they didn’t promoted fab as they should for other audience like Unity or maybe in general 3d Art Buyers or Game Developers.
For Example they could have used Free Megascans opportunity to get as much attention or Hype for other Engine Users. All they did was 20 seconds video on there Youtube Channel