Guess that's a warning for everyone that filled the "Registrant Mom's" field in their domain purchase.

Yes.

https://news.ycombinator.com/item?id=42363727 - Itch.io Taken Down by Funko

itch.io is over 10 years old, so my guess is that the owner was living with his parents when he registered the domain, and he never bothered updating the WHOIS when he presumably moved out in the intervening decade

/me registers Stifl.er

well the owners mom yeah

they apparently tried to get itch.io removed from their registrar earlier today