Heh, can confirm this.
I recently (Recently being like 1 year ago) got permanently banned from there. When I emailed them to find out why, it was "Unauthorized purchases" Aka hacking into the system and giving myself free currency, according to them. Like what? You think I would spend 4 years on there, not even getting a single warning, and regretfully buying atleast 10 of those Roblox cards then just suddenly do that? I didn't even have any changes in my balances.
I was banned for complaining about an upcoming feature, when I asked the moderator to revoke it, he said "no such ban exists". (i quote) It said "1 day ban for spam".
ROBLOX moderators obviously don't know the difference between a complaint and spam.