Here's a hot take: maybe you shouldn't spoil that your game has LGBT stuff in it if the discovery or realization of said LGBT stuff is integral to the plot. I'm actually specifically thinking of Pride Month sales and the like. By featuring games like Celeste and Unpacking they're basically spoiling the big twist - or a twist, anyway - which voids the effect of the storytelling.
I played Celeste blind and of course going in you think it's just a cute but punishing platformer in the vein of Super Meat Boy. The first twist is that it's character-driven and it's about anxiety and/or depression. The second twist is more nuanced but in my interpretation has to do with the protagonist accepting her trans identity. Something that is so much more effective when you're sharing that journey at the same time with the character, instead of knowing ahead of them. An LGBT tag works against the plot, and I'm glad I played the game not knowing. Just seems like that's how it's meant to.
Then there's Unpacking, which I saw featured in one of those Pride Month sales, effectively spoiling a super important part of the story (in a game where piecing the story yourself is the whole point). It's a great, chill little game in which you catch glimpses in the life of a person. The story is essentially about creating your own place in life rather than finding it or accomodating to someone else's, but this is framed in such a way that the search itself is a crucial part to get to that point all the same. This is a lovely message. And I won't say how, but the roadmap becomes super predictable as soon as you see the game tagged LGBT and reach a certain point in the story, about halfway through.
And for the record I don't think this is typically an issue concerning most games with an LGBT tag, since games are rarely about sexuality or sexual identity. But when they are, is it better to showcase it to the public in the interest of visibility, or is it better to preserve the story's integrity and let it unravel unspoiled, as it is the point?