Almost the same story for me
- living in germany
- tried my account on 3 different devices
- no free gems, coins, or gauntlets
Though: No trip to czech republic 😉
Let me add some experience
- tried in different wireless networks and cell-providers-networks with no different result
- from time to time i see some adds inbetween levels
But it´s always one of the same three
So my guess it´s a broken ad-service; maybe limited to Germay/Europe. But some adds seem to be cached on the local device.
From another device, another time long ago and another game i do remember there was a limited game experienace when the device was rooted and an add-blocker was activated.
Though none of the mentioned devices in tried PvZ2 on is or was rooted before; nor is an add-blocker installed!