Forza Horizon 5 has a new vaporwave station and whole aspect of the game with 80's cars and neon lit areas and things your avatar can wear. It's definitely getting more mainstream.

Vox did a video about 8 years ago on this happening.

I think pop music frequently pulls from more esoteric influences. It's almost inevitable because the people who produce music are music fans themselves

Yep. Almost all genres eventually provide influence to the stale pop formula. The hard thing is when the genre itself gets flooded by pop music and dilutes the scene to the point it becomes hard to find what you originally liked. That's what drove me out of the EDM scene. Loved stuff in the trance and house genres for over a decade from the early 2000s and then pop caught hold of it and slowly hollowed it out. Haven't been able to enjoy much of it since and moved on to other genres.