I don’t meet ICO pools often. Maybe it is because they are not very popular. I know the only one project where the investors were organized such pools. It is Telegram ICO. It is so because participation in this project is restricted.
The majority of pooling scheams in crypto are quite suspect in my opinion . Anything that involves handing nicer your private keys on the promise of future returns seems to be a risk considering the lack of regulation and the amount of exit scams have popped up. Not to say that this business model is bogus, I think it has huge potential, pooling limited resources together for a greater goal.
There are pools popping up in many places, just make sure to do your diligence and contact the admins to get comfortable with them because there are scammers out there. Conversely, there are some very good ones. Here are a few:
1035 Club
ICO PP
Moon Syndicate
You should be able to google them to find each.