Binance, okex, houbi and several other IEO launches from the top exchanges actually don't force people to participate there, and hold their tokens. But it is a rule that for each IEO participant must hold a number of their tokens to be able to participate, and if you don't want to, you are not forced to participate there either. I think so, anyone who wants to participate then follows the rules and for those who object then go and try to find IEO on another exchange.
Yes, we have to follow the rule, this normal, but what if the rule is not fair, why you forced me to buy and hold your token to participate, this not fair.
If you think its unfair then dont participate or look for other exchange to buy a specific token. Maybe its the strategies of the exchange so they can also benefit on a new project, but I dont think its unfair especially if the project is good. Binance is my top choice, its safe and didnt force you to do buy anything its pretty good.