Big update today ! I've added 3 themes : Internet maps, Animation and Monument ; "Donator maps" --> Donator maps ; adding back "Upcoming maps". I've also lost the "Difficulty" part of the parkour list because of 25000 character. (Still on my computer, but can't adding back, even in another post.).
Only just caught wind of this and thank heavens I had before I made a map with a similar theme and consumed my time for nothing. Thankfully the build I’m working on doesn’t really categorise under any of the mentioned ideas.
A helpful and well made list. Let’s hope the sheer vastness doesn’t scare mapmakers away.