It is highly unlikely for scams like these will go away. Especially now that there are more hunters out there that are willing to take up job because of the pandemic. Overall i just feel bad for hunters that spent their time on these scams.
Many hunters that will not do research if they are working on scammers and many developers who can create a project that looks like a good project, they have no problem with promoters since they already have a lot fo bounty hunters who will work for them in exchange for free pennies or none at all, in fact, these scammers are scamming bounty hunters and investors.
I think it is difficult to determine whether a project is a scam or not because so far sometimes the project will have many ways to keep their true goals hidden, it's better to be careful when participating in a bounty campaign or participating in a coin offer, you better can collect all the projects that have occurred scams and record all the teams that have been scams so you can have important records and can find out whether the project team is indicated as a scam or not, so maybe that method can help you to find out whether the project is good or not.