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As Microsoft makes Xbox Live an entertainment service that (including , Android and iOS), it's also . Since it's been in operation since 2002, many commonly-requested aliases are already taken, but now users can grab pretty much any name they want, even if someone else already has it.
Now, it will still let you create a new user name even if someone else has it, but it will auto-assign an ID number after it to make yours unique. Other services like Steam and Discord already use a similar setup, and it should mean an end to or so that new users can get a crack at them. Of course, if you've been around for a while, everyone will know you are the original CheeToMan247 given your lack of an add-on ID number.
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