Brevity is the soul of wit..
I have nothing more to add here. Why is the description of this stage so short?
Here the main theses, the actions that are required of the participant are described. If the project has a main bounty program, then it's just an accent
But why is it even necessary? why it was impossible to organize a full-fledged bounty program for all directions at the same time?
Correctly written. It is the accent. The project, apparently, lacked participants, so the developers decided to encourage participation in this way
To be honest, I like this stimulation, since it takes not much time to complete all the phases described by the developers
It will be more correct to write not "developers", but "project team". After all, it is the team that makes up the conditions for the bounty program, the developers create a platform