It's pointless, because you could write this about literally any form of counterculture.
What starts off as a rebellion against the mainstream gradually gains popularity, then simply joins the same mainstream apparatus it once rebelled against.
Rap, grunge, hippies, etc
Has anyone yet written the complete history of how Pride went from a vibrant counterculture to a civil rights movement to a sort of unofficial corporate-sponsored state religion whose observance is subsidized by taxpayer dollars and sometimes compelled by law