Questionnaire - Heuristics for F2P Mobile Games

Hi guys... 
I'd like to ask for who has some experience in F2P Mobile games, to answer this questionnaire. It is the final survey of my P.h.D. thesis where I am defining a set of ARM heuristics for the design of F2P Mobile Games. 

Anyone answering it is giving me a big help. It is a 10 mins questionnaire since it is focused on agree/disagree questions.

https://goo.gl/forms/nJmINBXak7DvYrff2

Best Regards!!!