It is true that celebrities have to be careful to time their coming out so it isn’t TOO blatantly for promo. I know Sam Smith got some pushback on the same issue, because he came out very shortly before his album was released.
Personally, I think that is all nonsense. Nobody is required to come out, they don’t owe it to us, and if they feel that they have to stay closeted in order to further their career, that is a perfectly valid decision. And on the flip side, of someone comes out and that actually boosts their career - isn’t that awesome? Isn’t that a huge step forward? That being open LGBTQIA+ can actually help a person’s career rather than hindering or ending it?? I think the fact that coming out even can be used as PR is a sign of how much things have changed for the better (long way to go, though).