Rather, there is another reason. There are specially trained people who hunt for bounty campaigns. They can run 100 or more campaigns at a time. That is why there are a lot of participants in all bounty programs.
I heard about these, and then they sell tokens immediately on the exchanges, thereby lowering the price several times lower
Therefore, most of the projects issue tokens in parts, so that there are no such problems in the future and this is the right solution
If this is due to the conditions in the roadmap, then there is no problem to issue tokens in batches. Although most often the campaign manager can change the conditions of the bounty, as I understand it from the bounty that I saw.