With a large allocation, the bounty can threaten the initial listing because many people can dump when the initial listing and the price can go far down. so actually bounty is also a threat
A big part of the bounty campaigns are only a few per cent of the whole allocation. This is because the teams want to prevent dumping and that the price fall.
I am beginning to get fed up joining in the bounty campaign, because I always get scammed, since last May of 2018, up to now, I still haven't get any rewards from the campaign I have joined even its finished.