The names displayed for users should be purchaseable and tradable, in similar fashion to how CryptoVoxels and perhaps Decentraland do things. This way you don't end up with a big chunk of regular players having the same name as a top professional player and so on, like it happens in Dota2 for example, as you'll meet a lot of "Dendi's" around there, most of them being noobs.

Also, you don't get stuck with a specific nickname that you might not want anymore after a while, plus it encourages people getting onboard faster, investing money into good nicknames (like .com domains), as well as having a good brand if being pro and so on.

https://opensea.io/assets/0x4243a8413a77eb559c6f8eaffa63f46019056d08/7384