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I don’t understand this question at all, because, as I know, sim cards are sold almost everywhere in the world after presenting documents confirming your identity. So every smartphone with this sim card can be identified by the buyer of the card. Of course, phones are given to other people, can be stolen, and so on. But, I think that in an extreme case, of course, law enforcement agencies can still figure out the transmission chains of the phone and this sim card. But, unless of course there is an urgent need to figure out criminals or scammers.
So such authorization requirements are generally a formality for a casino that simply collects statistics and maintains its user databases.