This is a puzzle to me. Uber faces some critical issues ahead. If they can solve them, the bikes will be a rounding error. If they can't, the bike business won't be enough to save them. Why add the complexity when they could buy or build something later? I especially can't figure out why the Jump CEO would do it. The odds of their work surviving to the 10 year mark seems so small. It reminds me of something like Dodg…
As for Jump;
https://www.crunchbase.com/search/funding_rounds/field/organ...
They just announced a $10M series A in January. To cash out at a $100M valuation doesn't seem like a bad outcome; after just doing just a series A, the founders' stake is likely to be in the 25-50% range (I'd guess in the lower end).
Obviously the zeitgeist is to shoot for a unicorn, but there are plenty of reasons to chose an earlier exit, only some of which suggest that the underlying business is shaky.
(Dodgeball sounds like a great deal BTW; rest & vest for a year or two, and then go start your company again except this time without having to bring in outside funding for your seed).