Question about Appnext

I decided to try to see such results with Appnext and I emerge a couple of questions to see if anyone can answer.

  1. has anyone had any problems with your SDK ?? It is 100% compatible with google policy??
    2.You know if you have good cpi for Latin countries especially Mexico is my 90% of traffic south america.
  2. the sdk, I see GET_ACCOUNTS requesting permission for sending emails with advertising from the interstitial with a button. This allowed by google or better not to use this feature?

Thanks all.