Who cares? If you participate from the beginning of the campaign, you will earn the same number of tokens.
After it becomes clear that the project is promising and the fees are good, there will be a lot of people willing to take part in the bounty campaign. Thus, the share of each participant will decrease. If you start to participate now, you can get a significant number of stakes.
An interesting idea, but if you are confident in the prospects of the project, you can become its investor.