[phire]

Speedrunning communities generally hate it when having more money leads to an advantage.

If you ban deliberately smudging/scratching the disc, then some runner with a lot of money will just buy a lot of copies of the disc, find the one that glitches the most consistently (because of pre-existing scratches, or even manufacturing defects that aren’t visible)

Allowing some kind of mod is the most equitable compromise.

[vanchor3]

They typically ban the glitch entirely. For example cartridge manipulation or "CD streaming" glitches in Zelda speedruns are banned, and if you submitted a run containing them while claiming the game did it on its own, they would probably tell you to get a new copy of the game.