I don't call it normal,i name it scam. Close down bounty group means they don't want anybody to speak, blocked access to the spreadsheet means they probably don't want to pay the reward to the bounty hunter, what an ironic project.
Exactly, that's a matter of fact, if they are closing the bounty group and also blocked access to the spreadsheet means it is crystal clear that it is a scam and they have not had the intentions to deliver the reward to the participants. Now hunters get used to with such scams.
Hunters need to move forward and avoid such kinds of bounty works, it's clear that if there's no information then the team have a high
chance not to pay the participants, waste of time and efforts, things that each participants needs to learned, you have to be more selective
in picking the team or projects to support to avoid this kind of team.