I do not understand why such rules are changed when the bounty has entered the final stage, and almost all such cases occur with potentially successful bounties.
Has it been previously arranged by the manager or the bounty team ...?
If true, this is totally unacceptable, because they did not appreciate the role of bounty participants who had promoted their projects.
Most of the scam projects tend to do this. All they want is free advertising for their shit projects and raise money out of it and run away like pigs.
This is exactly why we should not join bounties randomly and instead we should do a hell lot of research about the project as well as the bounty manager before joining the bounty campaign.