[ycmbntrthrwaway]

> Random time later send garbage

Random is bad because you need some random distribution and by gathering statistics server can determine if your distribution of delays match. Delay until really clicking the button would be highly individual. That is why I said "when they open the application".

[FabHK]

True, if you did this, you'd want to either match the (empirical) distribution, or, as I believe you are suggesting, just pretend the (non-existing) button was pressed shortly after the user opens the app next time.