Interesting . . . but
Like so many startups, this is an interesting idea but it seems to be a case of champagne life on a beer budget.
It is unclear what the advantage of a data lake would be; even more unclear what companies would be interested; and totally opaque why a company would trust the keys to its data to a startup like Onehouse.
Maybe a second round of funding will let them build out the concept but I suspect the end goal is not a product but a buyout by one of the data behemoths.