Twitter source code was leaked on GitHub shortly after Musk’s layoff spree

If the disgruntled staff member simply copied the code over then surely there would be no way to track down who it was? Even if they found a staff member had accessed tonnes of source code before they left, how could they prove it was that person who leaked it?

Hope for them that Gihub has some good insights because the list of angry ex-employees is very very long

I thought Musk was supposed to open source it himself a long time ago?