[robmcm]

You could still have the jump button on a game hooked up to flattr your app, taking more of the users monies.

It's a valid point.

[sch1zo]

IIRC the app developers already get part of the 10% fee flattr takes as they are somehow the referer of the "flattr-clicks". And if the app developer unknowningly flattrs the app for the user, the user could immediately see that on his flattr dashboard and inform flattr about the scammer.