Today one could argue if a license for BTC casino is needed at all?
If you aim to open a fully lawfully casino whether its fiat or Bitcoin, yes you will require a gambling license in the majority of countries. As I stated above, even if you opened it in a country which doesn't require a license at all...
I fully agree with you and that is why my answer to the OP question in the first sentence of my post was:
Unfortunately, you can't run a casino without a license anywhere, even if it is a BTC casino...
When I already explained everything, just wanted to discuss hypothetical further if indeed today license is needed for BTC casinos?
Why?
...you would still need a license if your casino accepts deposits or withdrawals from other countries which require a license...
Exactly, that's why because one can argue if license is really needed, when we use only BTC for deposits and withdrawals or even Monero, Dash which is fully anonymous?
Especially casino that doesn't provide any information about their geological location and the trust is established by a really good working and verifiable provably fair system.
In such circumstances, when the trust problem is resolved, again there is no need for licensing to attract clients.
If one would be able to find a location where a gambling license is not needed, then maybe it could be possible to start such a casino and to be successful?