Comment by ghostly_s

Well the teams in Pokemon Go aren't quite as generic as Teamred: they are Team Instinct, Team Mystic, and Team Valor. Presumably Nintendo has trademarks on those phrases, and I’m sure all the big print on demand houses have an API for rights-holders to preemptively submit their trademarks for takedowns.

Nintendo is also famously protective of their IP: to give another anecdote, I just bought one of the emulator handhelds on Aliexpress that are all the rage these days, and while they don't advertise it they usually come preloaded with a buttload or ROMs. Mine did, including a number of Nintendo properties — but nary an Italian plumber to be found. The Nintendo fear runs deep.