It's not just about these 4 projects. More than 75% of ICOs failed in 2018. I too had participated in some bounties and received the payment as well. But the main mistake I have made is that I didn't cash them out as soon as I had received them. I actually awaited for them to start their business so that I can get good value. In this process, every single tokens of my holdings lost more than 90% of their value and many of them even got de-listed from the exchanges.

The entire ICO market is becoming very similar to the HYIP market where a lot of shady people are involved in ruining public money and this nuisance won't stop unless we have a filtration process in place. The way ICO owner asks for KYC, we need to ask for the same from the ICO owners before we invest any significant sum into it. At least we will have something to pursue later on.