A random walk through something like this can be more helpful these days: https://www.music-map.com/ (found on HN last year)
Even within techno (my favorite genre), which is already a quite narrow genre in terms of sounds, the variety of novel sounds birthing new techno sub-genres over the last 10-15 years has been wild.
To give a recent "mainstream" example, Odd Mob has created a certain sound that blew up in popularity despite not fitting neatly in any of the existing boxes we had (tracks like Get Busy, Losing Control, Palm Of My Hands), other producers copied it and by now you have anonymous shitposters on social media complaining that most new songs sound like they were made by him.
But I still cannot just take someone else project and put my things on top if it ain't open source and it isn't and there seems no indication of wanting collaboration. So I could contact him if I ever made anything, but I cannot just make and release it.