i mean..... it's easy to ban his standing infinite...because its easy to draw the line.
But how do you ban diddy's infinite (stop it after 5, 6, 7, 8 times? doesn't it seem arbitrary?; ban it altogether? so a character is now restricted in what it can do? and what leads into the infinite will usually set up for something else....so who is to say whether she or he is setting up an infinite or something else?); infinites are easy to call retrospectively....but in the middle of a match, you can't tell
edit: but, yeah, infinites are stupid and ruin brawl imo and I would love to see them all banned but that's not realistic.