That is quite a welcome move. The play store can be a legitimately scary place. I have a few apps on there and I get e-mails every few days from "advertisement networks" that all claim that they will increase my eCPM 5x to 10x, that they will be non intrusive to my users, that they have high profile partners and innovative revenue sharing schemes. They just need me to add this little library of code to my apps.

Now I always refuse these offers. It's too difficult to figure out who is legitimate and who is not. However, these offers are so frequent and sometimes they even look interesting and original such that I can imagine some developers would be willing to try them out.

Every time I buy an app on the play store I wonder: Has the developer succumbed to the temptation and let a shady piece of code with spyware or adware in their app?