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Sure, stk might also do this sooner or later but in their 8 years of existence they haven't done it yet, so why does a young site like whale need it?
For the casino, the investment pays off relatively quickly. Launching such a token now takes only minutes, and integrating the token into an existing platform should also be relatively quick.
However, this opens up many more (marketing) opportunities, as I described above, and thus also the possibility of generating more capital. Sooner or later, it will be considered good form for casinos to offer such tokens.
Whether we as customers actually need our own additional tokens is, of course, open to question, but from a purely marketing perspective, it makes a lot of sense.