It's a user name or most likely a nickname I don't think putting your first and last name on user name is really good idea I think using a fake name or identity is much better.
To have some anonymity and privacy even in the casinos on where you play at I don't think even if they ask for KYC it's still better not to use real names.
So far I haven't encountered one yet on my whole time playing online gambling games or maybe I'm not just aware of it.
I didn't see any names that are from bitcointalk that I know of, but they could be using a different id there.
At the end of the day roobet is continue to give a lot of their earnings back and that is how they changed the whole idea of them as well.
I remember back when they first started, they were not really 100% loved by everyone and not everyone rushed here, their early start days weren't huge, and on top of that they were 1% house edge and changed it to 5% so all of a sudden this place was getting negative publicity more than anything and there were a lot of fires to put out for them.
What did they do? They started to give away soooo much money thanks to that 5% that people are not talking about anything bad, they are all taking about the money they give back. That is how you do marketing perfectly.