From their Facebook page:
"Regarding price drop. HERE is our statement. The main reason: piracy rate on Android devices, that was unbelievably high. At first we intend to make this game available for as many people as possible - that's why it was for as little as buck. - It was much less than 8$ for SHADOWGUN but on the other hand we didn't dare to provide it for free, since we hadn't got XP with free-to-play format so far. - However, even for one buck, the piracy rate is soooo giant, that we finally decided to provide DEAD TRIGGER for free. Anyway - DEAD TRIGGER is not FREEMIUM, it always was and still remains FREE-TO-PLAY, that means, all players are able to play it without IAP! We stand up for this statement, because all members of our team are playing (and enjoying) DEAD TRIGGER without IAP."
Dead Trigger for Android
Update: iOS version is now free! Those who purchased the game while it was 99 cents will be given in-game currency 25 gold and ten casino chips in the 1.1.2 update.
Edited by SurB86, 03 August 2012 - 10:51 AM.