In my years of experience with bitcoin there is only one effective way to avoid scammers. In joining ICO even if you do your research you will not know that they are scammers until the ICO is over. Even if how many preparations we do or make in the end we still end up being a victim to scammers. The best way to avoid scammers is to no invest your bitcoins. Just hold it in your wallet and hold it for a long time and when the price is right you can sell them and you will have a good profit.
I am also a victim of a scammers for a very long time I've been scam here for a lot of times and neither one of them I do not have figure out that they are scammers because they are really as normal as what a normal icos are and they are really hard to know it you will be scammed or not. So for me it is just a matter of luck because you always join an ico that you never knew in the first place it is like going to a war alone. Even if you check it much more if they are great scammers they will be successful.