The upside is that anyone can get in on the "ground floor" of these projects and crypto currency - for all its flaws - does do a good job of securely transferring 'ownership.' Fake crypto is not, as far as I know, a problem.
The downside is obvious for all to see: it's difficult to figure out if a technically complicated product is worth investing in. It's doubly difficult when the people working on those projects will get an immediate monetary reward for attracting investment.
I do think it's unfair that only the rich can bet on early-stage startups, but it's impossible for me to ignore the anecdotes of naive investors losing their savings on poor crypto investments. I'm not sure what a better system would look like - perhaps one where investments are taxed to create an insurance fund. Though the downsides to that are obvious as well.