The magic the gathering subreddit has to moderate out the word "proxy" or risk getting banned. seems plausable like there are just a lot of speicfic rules you gotta follow to be a subreddit
For what its worth i used the term proxy for a decade almost exclusively to mean a cheap paper copy of a magic card (or even just writing the word on a sheet of paper and sticking it in a sleeve over a land) and I find this restriction wrong-headed.