Assuming all crypto projects are scams is no different from assuming all cold fusion projects are pseudoscience / scams.
I'm not assuming that all cryptocurrency projects are scams! But at least 99% of them are scams. And people lost large amounts of hard earned money in false promises.
This is also often reported in big media.
Thus cryptocurrency has a bad image, which shouldn't be coupled to a topic which also has a hard time to gain credibility.