For such rich source material, Touhou spawns, arguably, the worst slew of games in the industry. Instead of fighting games, adventure, racing, tower defence etc., we constant vomit of "bullet hell" copy-pastas and this, projectile diarrhoea, "recording game"...
What the fuck do you mean, it's a rythm game , with a story ? It may be called "reccording" but you just follow a patern of note, just like a rythm game...
Also the fact Tõhõ is big ain't mean shit, since it's a free IP (or something along those line) and a popular one, with already made "asset" since it has characters and such, any lazy dev that want to use the brand a selling point will... just do it. Hence why you have so much shit game coming out from it. Easy to sell, easy to do (no character to "create") easy to be seen by the "fan"
Also the fact Tõhõ is big ain't mean shit, since it's a free IP (or something along those line) and a popular one, with already made "asset" since it has characters and such, any lazy dev that want to use the brand a selling point will... just do it.
Hence why you have so much shit game coming out from it.
Easy to sell, easy to do (no character to "create") easy to be seen by the "fan"