I don't think that banning the use of duplication glitches is necessary. Banning dupes only lengthens runs and is against the very nature of speedrunning.

I might have bias as my run was the only one taken down ( as far as i know) for using the glitch, but I think my point still stands.

Maybe a co-op glitchless category?

Isn't there already a glitchless category for coop?

I was thinking more duo and singleplayer glitchless.