I began to think this would be a waste of time with everything I learned because almost all the projects I had followed ended in scammers. Is this a waste of time for me?

I do don't see it as a waist of time because time will come when some of the tokens you are promoting will bring good return in your favor. The only advice I will give you is to study the bounty well before you join so that you will not end up promoting scam project that will not pay you for your work and at the same time go away with investors money because of you advert.