We cant control it but we can be aware of it...  For me the best way to lessen this reported scam is to keep everyone aware of it... And how?  If you find out that certain ICO is scam...  You should share it here it will be very helpful ...  If everyone will do it  surely we will lessen it...  But as the one who uses crypto we should be the one who have our own research about ICO...  If we are the one who will do probably we will never become a victim of it...