That's fair and those are embarrassing tales in Silicon Valley. One difference is they were/are bets on a technology that wasn't in the market yet.
We buy and sell thousands o homes, hopefully at the appropriate price for the market's current level of risk. Hard, deeply appreciated by customers, but not much handwaving on how it will go to market.
Sure, in principle large investments should mean good DD. But Magic Leap fans were pretty surprised this week. Theranos also raised more than Opendoor.
It's not fair to put other company's problems on Opendoor, but the point it's hard to accept the large cap/DD argument with so many counter examples.
In any case, it would be great to see you succeed - good luck.