In this time most ICOs are the scam and not profitable with market condition. The ICOs have given decent profits a few months ago. Now, scammers get that method to scam a large amount of money. Then you have to make your own research before you invest any ICO.
Well I actually think that it's the other way around. Scammers were and still are the majority of people in ICO segment of the crypto market. Nevertheless, as more ICOs appear, they start to face more competition with each other and necessarily have to get improved to be taken seriously. And I don't think that it's impossible to avoid scammers. For example, if the team is listed on the website and its members as well as the company as a whole already accomplished something before, it's unlikely they will risk losing all of it by scamming people. And besides, if it's known where the company is officially registered and who are the main people there, they could even get arrested for such a crime. Surely, nobody can promiss profits, but at least it's rather easy to understand the intentions of the company that launches an ICO.