I don't think all new coming projects are doing scam but those you mentioned. So many good project like dia data, dego finance, hex are got successful recently ever more that maybe i don't know about. So it isn't fair to blame all new coming project as scam those project that you mentioned, listed on low quality exchanges, continue trading with low volume even with fake bot. Most of investor avoided those project. So it was your mistake, selecting those for promote
Yes, there are wide number of new projects that are scamming vigorously, all they do is doing presale, if at all, they list on low volume exchange, like exmarket, catex, and all of those scam exchange, I experience this when u was participating in bounties last year until I stopped.
You just have to select one out of 100 bounties to have a successful campaign promoting experience, the funny thing about this is that, those scam project keeps repeating this thing, don't know if the owners keeps creating another while the older fails away.