Re: PvZ2: Can someone steal my game data using my player ID?

A good question.  

If I were a hacker and have access to the main system, personally I think it is possible but not for my own gain in your resources. It would be fun to watch you suffering from random loss of resources whenever I edit your saved data for my entertainment.  👿

In short, yes and I could have fun at your expense whenever I feel like it.