I once met some people involved in Planetary Defense. One of them launched a crowdfunding campaign to fund development of his concept, the Hypervelocity Asteroid Intercept Vehicle. The crowdfunding campaign only raised some 4% of the needed funs. Nobody wanted to pay to save the Earth!
TBH it's difficult to take serious any campaign running through these crowdfunding platforms. My "scam alert" sirens start to go off any time I see these kind of links.
I don't know this for a fact, but I suspect the Principal Investigator was sold a bunch of baloney from the crowdsource outfit. They do take a large portion of the funding, after all. The PI had already been through Phase I and Phase II of NASA funding and likely went to crowdfunding because he lost Phase III.
https://www.indiegogo.com/projects/help-defend-earth-against...