The site seems okay so far but there is a huge security concern for me.
I did some digging and found GGG's Sizable and fatty.club both run on a "white label" content selling platform called Scrile Connect.
https://www.scrile.com/connectIt basically allows anyone to create an Onlyfans clone with some extra social features.
The problem is the company maintaining and developing the backend is Russian.
I would not recommend trusting your credit card & personal information to any site affiliated with Russia, especially given the current situation.
I doubt GGG has even considered the potential privacy risks when using a Russian-based company for her site.