I guess the bunny still got something similar to the Coke-branding that Santa got to help product sales, but for chocolate sales instead!?
I retract the 'rabbits' part of what I said, but I still think it's ultimately a fairly weird taken-over/hybrid-mythology festival! I'm only able to talk about Easter as I know it in Aus though!.. I totally acknowledge festivals and their timing/meaning are very different in other places.
What it does state is in agreement with the wikipedia article on the connection between Ēostre and rabbits, namely:
The earliest evidence for the Easter Hare (Osterhase) was recorded in south-west Germany in 1678 by the professor of medicine Georg Franck von Franckenau
~ https://en.wikipedia.org/wiki/%C4%92ostreThis is the earliest still extant written account of folk practices that had been occurring for some indeterminant time.
We are aware that the brewing of beer predates by many centuries, millenia even, the earliest still extant written account of the practice of brewing beer.
We have actual remains of rabbits from long long ago.
The point being much human activity leaves little trace, we'd be wise to not assume the only human activity was activity that left a pyramid or giant stautue in its wake.