this happened to me as well. I had repos, I was even approved members of several large scale open source projects. Just did not have to do anything related to G

this happened to me as well. I had repos, I was even approved members of several large scale open source projects. Just did not have to do anything related to GitHub for a few years. Turns out they renamed me and gave my name to someone else upon request. My links to various repos in my github scattered around the internet (with the old username) still works (so I assume, the new owner can't create repos with the same names). Don't know why GitHub goes through all those hoops to allow this to be honest (yes I'm salty). Like if it was just a registration and empty account that is understandable but they renamed an account full of repos and memberships and their infrastructure supports keeping old links active etc. Just weird.