To be fair, this largely depends on the country you're in. Appreciate that the bike is going to be pretty useless in somewhere as car-centric as the US, but I've lived in rural areas in the EU where the bike was quite enough.
I'm all for an invite-based system, although we will need some way of combating 'invite trees', where one bad actor invites several others, who subsequently invite an exponentially increasing number. A reasonable delay on the invite allowance would go a long way, I think.
To be fair, this largely depends on the country you're in. Appreciate that the bike is going to be pretty useless in somewhere as car-centric as the US, but I've lived in rural areas in the EU where the bike was quite enough.