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 Why did #Signal have to add those shite numbers to usernames?

And why does #Spotify not even have usernames? 
 "...must be unique and must have two or more numbers at the end of it; a choice intended to help keep usernames egalitarian and minimize spoofing. " 
 “egalitarian”

How? 
 If the username "chilidogdude" is highly sought after just anyone can have that username but everyone has to have a discriminator added to the end. All users are equal, and it also means no one can get a username that's exclusive and then try to sell it.
Usernames are only to establish chats anyway, after that you don't see them so it's not that big a deal. 
 Hmm 🤔! Understood! Telegram usernames are actively bought and sold as NFTs 
 Well, some discriminators are more sought after than others. In the Bitcoin world that would be 21, so they can still be sold, for example on @Plebeian Market 😉