yeah but it says play anonymous in op of this thread. just wondering which one is mistake because it cant be both.
It's not anonymous in the IP (VPN/Tor) sense, but about the bet placed can be
hidden from the public.
For example:

No one will know that I won the 349.55x if I didn't post it here.
Even if you did not hide your username there on Roobet we could not have known that you have won this bet because there is very difficult to trace people from username as people do not keep their real name or forum names on the gambling site.