I wouldn't blame everything on BestChange, but I wrote about their terrible review system multiple times and I demanded improvement and update.
It's interesting that not long ago before you created this topic I asked BestChange about this KYC icons and if they can guarantee that exchange won't ask for verification, they replied NO, they can't guarantee that information is correct.
If exchange is using third party exchange they need to publicly show this and say they can freeze your coins at any time, otherwise I wouldn't use this exchange at all.