content: App was useful but I was very disappointed when a large number of trees were moved to premium without warning. I had been saving up and watching extra ads for coins for weeks and then found there was nothing I wanted to spend those coins on. It felt underhanded  I thought the deal was that I watch ads app gets revenue and I get a nice tree but then that deal changed. If youre going to move features to premium it would be polite to warn users so they could spend saved coins first.