I think it is mainly due to the bull run of Bitcoin price, I hope this situation last as long as possible.
I would not say that. That days Bitcoin was either in flat or was only charging to go up. Speaking about DIA - Bitcoin price growth barely influenced, as tokens price remained the same. Speaking about FreeTon - its price went down, but this seems due to strategy and decisions of the project owners. Interfinex - price went down after bounty distribution. But this token is listed only on one exchange with very low volume, so its price can be influenced with low token amount. The reason I managed to get 160 USD from it is due to low number of hunters in signature and big bounty pool, plus I managed be one of the first who had sold rewards (made my self to wake up at 2 am).