Not all are scam but what we have to do is to always conduct our research before failing in wrong hands as some project owners will dump and leave the system to another project so let's always try our possible best not to fail in wrong hands.
Not all, but there are a lot of scam projects, maybe in 100% there is 70% on them that need to be avoided and need to gain more a lot of info's so we will not fail on their hands and make a decision for our self to learn what others experience. scammers are always there to get what they want.