Full name does not seem to me to be the intention either. After all, you don't want something like that to become public. The crypto must be equal and anonymous (at least as much as possible).
Probably they can change that policy a little.
There is no Obligatory mate , Just Join at your own discretion .. But it's very nice to have you Board and play with it.
I doubt that they check the full name versus your passport or something, obviously KYC is very important but you do not really need to go with that. I personally used just a made up one name, not even cared enough to write a last name, just said "Mike" and it was enough, nobody asked me more, and I can promise you my name is not mike
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I don't know what would happen in case if I won and my full name is not the right full name, I really have no idea what they would be doing in that situation, but I rather not earn a cent and keep myself anon as much as I can versus giving my full information to roobet for absolutely no reason (why would they need it) and get 50k, you can pay me the full 50k and I would still be not sure about giving you my full name honestly. So, destroying the anonymity of your players is not the way to distribute cash, hence just "mike" would probably be fine.