I don't think that many of those users will deposit back to binance if ever they're given the license. It's one of the lessons that many are starting to learn that if they're being instructed to withdraw their funds so that they have the whole custody to it, they're going to love it. For many hacks have been reported to exchanges and that will give them the authority to their own funds. They should have learn that long time ago not only when binance tells them to do it. So whether the license is given to them or not, I think that many of these users have already understood the importance of keeping their own funds to themselves.
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These users do not use centralized exchanges because they do not understand the importance of self custody. I can bet that the majority of the people who were asked to withdraw their funds to private wallets didn't do exactly the same, they might have sent those coins to other exchanges.
Some people are just scared of self custody, they would rather sign up to an exchange that will ask them for email and kyc to recover their funds anytime they need. The fear of self custody is the case.
While some are their to take advantage of some opportunities. So, they are returning in their numbers.