This is not about scam projects. This is about the projects which fail to raise enough funds due to what so ever reasons. When bounty hunters work for weeks and at the last moment project announces that they can no longer run it due to insufficient funds raised, its nothing but a waste of time and energy for us.
The reason why these projects are targeting bounty workers is because they know that they can raise funds with giving empty promises and once they raise the money they could say anything even if they are legit projects.
In my opinion, should project teams have enough fundings before they look for investors? What is called MVP is very important for the users to check for before investing.
If it is a legit project they will get the Angel funds required and then goes to the common investors and most of the time they do not need other funds if they get an Angel investor.