A lot of fake projects now are being introduced in this forum just to defraud people to invest. So we need to be very careful and be very wise in dealing with them. Much better to have deep research and understand first the real purpose of the project before deciding to invest.
Yes, we must be careful on choosing a project to participate on whether you will invest or just participate on their bounty campaign, you must still be choosy and don't believe on any project easily. If you have no idea about the project learn about it, and if you don't satisfied with their ideas then don't invest.