The accounts were created due to a bug in the system where the giftcard name endpoint (https://api.minecraftservices.com/minecraft/profile) didn’t have a ratelimit so you were able to spam that endpoint as well as the name change endpoint together to create duped account usernames. (This does not work anymore as they added a ratelimit)
These are all the known dupe accounts created using this method (they have all been reverted as of 3 days ago)
Sagishii
The accounts were created due to a bug in the system where the giftcard name endpoint (https://api.minecraftservices.com/minecraft/profile) didn’t have a ratelimit so you were able to spam that endpoint as well as the name change endpoint together to create duped account usernames. (This does not work anymore as they added a ratelimit)
These are all the known dupe accounts created using this method (they have all been reverted as of 3 days ago)
e9t - [00e2ab9b6b2f4f41b7efb55d5169f0b8] PrioE9T - [ef31f67558f2450394b75c30ade468af]k7u - [149e53fdecc24c6180a71c4e8e9c659a] PrioK7U - [4be171405292485787c1e4ba8fb90207]Prz - [9a066737945e40839ad9b22269f17a5d] Prioprz - [e74ad59110884062a18535c39759b7b3]GFY - [374108f2c1704189a8913bfc4c0fe459] PrioGfy - [e25ba3611790496eaf015cd3b7ee446b]YBD - [372d671cb16c4aa997d466e8ac297683] Prioybd - [8af6db3ecddb464e80573eaa1f1e4e59]UM4 - [f16f1a450a2a42ad8e64147a0556e6cb] PrioUm4 - [1e20fa4a368f407780cf69ebc110ebf5]HENT - [228695a1f5ef4565bd499cc687245309]hent - [8f472e7e74da44f1af068822ba874a37] PrioZonix - [44de0b9f0d1b49f6a94e735dc071ff3f]zonix - [08bfd320bf7646bd84d9229c96b596f1] Priosundae - [56778399e9874150a21da56c1839cf2b]Sundae - [84411aad35ac496abc646d76c07b854d] Priohelllo - [7211ae0bdb3f4680ae7cb34f2c4befc0] PrioHelllo - [ba5d76c5d2fb41c488e7f54552632f7d]CONDITIONER - [511a0663afe94084a42e0799c1ea023f] PrioConditioner - [0556c7b3b34941ce8de27a1c8f56e2fc]LoveMePlease - [10627754f045405bac86bb47904d8cd4] PrioLOVEMEPLEASe - [19ce6f864ac54238810bcc76a7225bfc](credit to mew for the list <3)