If anything, the devs don't have a record of screwing players. They take an approach that any possible exploit is the responsibility of the game so if they nerf it they won't take away from what players already bought. The only 'nerf' that can happen is them changing things for those buying after the changes took place or if new reward cards will have massively more card prints bringing down the value of individual cards that come from rewards.
From an investment in Dollars I just don't see any way it can be a bad deal even in the worst possible scenario. Main risk for me is that the price of Hive goes up more during the next 100+ days making it so that having held Hive would have been better. I'm converting DEC to Hive daily though so I'm quite sure I'll be able to recover the initial investment.
It's always a balance between giving enough to get more players and not giving too much so the Economy gets hurt. Right now with the growth the game already has had this past month, I guess protecting the economy will be more important.
Yeah I'll be buying quest potions with fiat. DEC right now is so valuable in the game! #hodl #airdrops