This market is full of new and hyped coins every day. If you do some research you could find that icos are hyped one time then ieo comes the exchange coins are hyped one time. Deflationary tokens are the same. Suddenly people started to talk about it and then many decs started to launch this deflationary tokes. For few days it was in hype then people started to lose interest. And now nobody talk about this deflationary tokens. But if you thing that some of the best deft coin have future you can put your money on it.
Its mostly about investing at right time. Many invested in right time in IEO/ICOs and got the profit in time and quitted before the collapse of particular ICO/IEO. If you want to get benefit from volatile nature of crypto then you have to take risk, no pain no gain.