Its a big PR stunt, personally I would never consider buying anything with in app purchasing as I dont like the fact I could pay £x and then have to pay even more just to use it fully.
I avoided this game as it was known for IAP so i didnt want to fork up cash for it, when it went free i tried it and it was very laggy on my O2x but was ok. I would be happy paying a few quid for it but I wouldnt be happy having IAP aswell as the low purchase price.
I still dont understand why people would pirate it for just that £0.75 but if it avoids IAP i guess thats the incentive... I wouldnt say piracy is really that bad but it could be better. I dont care about pirates, its to cheap for applications on mobile devices and if it is really expensive i just wont use it.
I think piracy is rife on both mobile operating systems but thats because its pretty easy to do on both platforms. Theres more Android devices out there so of course there will be more piracy, its hard to get any true figures anyway and since Android devices cover every price point you will find alot of people wont buy it because they have "no money", bollocks really as piracy is piracy but it happens unfortunately, it helps i guess (in a bad way!).
As soon as JB gets put on every android device piracy will be heavily reduced and probably less than Apple.