I recently went to change username to realise it was impossible to get a free username that was anything close to what I wanted, all because some user decided to use that name years ago to play Roblox once. While this is kind of inconvenient for me, I imagine it must be incredibly frustrating for new users (especially the younger ones!) to create an account. You are known on this platform almost entirely by your username, yet it is very hard to choose one resembling a name you want.
While this discussion has come up before in 2013, 2014, and 2017; I felt it would be good to state this problem again. This is clearly a problem affecting many current users and will not go away on its own. The longer this problem exists without intervention, the more difficult it gets for users to make new accounts and the worse the user experience is as users are restricted on their account customisation. I see this as a problem Roblox has to fix eventually if they wish to continue growth.
Now I’m not a web engineer and have no idea what Roblox’s platform architecture is like so I wont be making any suggestions on how this should be done, I feel that is for Roblox engineers to decide as they know best. I will however show that other games/websites have done this process successfully: Runescape, World of Warcraft, Xbox Live, Twitch, Twitter. I’m sure there are many many more too.
A final note to put this into perspective. There are likely a fair few accounts which are now older than the user was when it was created, which may also have been used for less than a day.