Nobody in the tech industry cares about DEI (most people I've met are downright hostile to the idea). All those companies in 2020 who hired DEI consultants and made big announcements about DEI and changed master to main were just buying cheap good will
Didn't Microsoft spend years basing the bonuses and performance reviews of middle management based heavily on the gender and race of who they managed to hire or promote?
The cynical take is that main was about shutting up Github employees protests against ICE contracts [1]. And it seemed to work: no more protests and another diversity consultant enriched.