Bounty is a good and effective marketing strategy, bounty hunters only get paid when the project is successful or reaches a minimum target, I'm sure devs. consider providing bounty hunter allocations even though only 1% of the total coin sold.
Promotion strategies using bounty campaigns are either effective or not clear that marketing is done by cutting costs lower than advertising directly on several crypto sites. if there is a project that makes both of them then it is a project that is fairly good in promotion.
for the IEO sometimes there are exchanges that prohibit bounty hunter activities during the sales process, but there are some projects that continue to carry out bounty campaigns at the beginning of their private sales.