Here's how I approach the EZ-Slide thing.
I use it -- on my thumb, when it sticks. I'd use baby powder, but EZ-Slide is easier to transport. I never use it on my shoe.
I've seen more people injured because of slipping in other people's powder than because they stuck. And really, if you hurt yourself because you stick, you're only hurting yourself. If someone hurts themselves because you misapplied powder or cigarette ashes, they are hurt without deserving to be hurt or because of the actions of others. That's a big difference and a personal injury lawyer will be more than happy to explain the difference to you if you should, say, happen to injure someone in a car accident.
If I see EZ-Slide being abused when I'm bowling, I will go talk to that team's captain. If it persists, I will get a league officer involved. If still no one takes care of the problem, I'll get the house involved. If I have to take care of it myself after that, I'll do it, and I'm more than capable of doing it on my own.
The fact that EZ-Slide is not outlawed by name means nothing. It has applications outside of shoes (see earlier comments about using it on one's thumb). It is not possible to put a substance on a shoe and it not come off on the approach. If it was, you'd never have to re-apply it, but you do. That's a law of science.
It goes on the shoe, it will get on the approach, and while I'm not very susceptible to having a problem with it (I don't slide much), I will look out for others since I've seen nasty things result from its misuse. I can also be that a-hole rules stickler guy that everyone loves to hate, when I need to be. And I can take care of myself if someone wants to make an issue of it.
I realize some people know how to use it better than others, and if I see someone being extra careful, I probably won't say anything about it. But as soon as I see it used, it will be me and not the user that determines whether it continues to be used. Don't like it, don't let me catch you using it.
If it sounds like this is my pet issue, bingo, and I'm undefeated. I make no apologies for holding people to the rules when a potential injury is at stake. I'm a really nice guy 99.9 percent of the time but when I need to be an a-hole, I'm quite good at it.
Jess