I guess you are talking about bounties. If you are ending up with scam projects you should search yourself and ask on what you really want to do. It isnt the end for newbies, there are a lot of opportunities that awaits you. Just use your time appropriately and lessen it with scam projects. Thats the problem for most bounties now, looking for a legit one now is difficult.
I agree, every bounty hunters now must upgrade their standards on how to choose the right bounty.
There are lots of thing to be consider for you to be sure that the bounty is legit and has a high possibility to succeed and stay in the market.