To an extent, they weren't betting on the business, they were betting on the masses eating up the stock.
And they were at least initially right, and cashing out 2-4 days after the IPO certainly worked for and of them. Stock going down required some significant portion of them to take their winnings.
They were betting on the stupidity of the retail investor, not the fundamentals of the business.
Indeed, someone with a deep fanaticism for Musk posted exactly that scenario as inevitable. This was to stand by his man when Musk asserted that SpaceX should be worth more than everything else on earth combined (he was pissed that spcx had fallen).
The dude claimed that by 2038 the 20 biggest companies would all be entirely space based exclusively, and that globally SpaceX would be the sole provider of space technology and the other 19 companies would be tenants of SpaceX. It all made sense to him because space is bigger than earth, right?
I can't find it, but among the usual suspects (space mining, space datacenters, terra forming), I was especially amused that his hypothetical "space banking company", because for some reason the financials of space companies needed to be managed by a company that could get stuff launched into space?