There have been many great pricing models posed in this thread to dis-incentivize gaming, but I'm a little surprised no one has mentioned the simple "make bird hunting a full time job with benefits."
Just like uber before them, bird threatens to upend some reasonably decent jobs in cities with bike share programs- assuming the bike share programs don't learn from taxi drivers and adapt.
So much of the reason these things work- and that the companies themselves become massively valuable is the externalization of costs. That doesn't have to be a given.