if I have a unique username in the form of a name + a 4 digit number, why do I need to create a unique username? The logic behind this doesn't make any sense ot

if I have a unique username in the form of a name + a 4 digit number, why do I need to create a unique username? The logic behind this doesn't make any sense other than the fact that they want to charge for a blue checkmark and/or they aren't satisfied with their current username setup. Both of which are not my concern as a user of their product. I shouldn't have to win the lottery to get my username back. I shouldn't be outbid by some kid with a python script who wants my name. Your name is your only true property on 3rd party sites/services. My username, is me. I am my username. To change it would be to change me. I kinda like me.