I do understand your concern, but you need to understand that because a price rise or fall doesn't make it a scam. I could remember Bitconnect price continue to climb until their exit recently. I was selling the idea of a ICO investment to a friend recently and his concern was that is not better to buy on exchange than invest in ICO because  most of these tokens seems to dump on exchange and this is what indeed played out because the priceof the token is now below the ICO price and this is a project I believed in long term