One of the advantages startups have is higher risk tolerance than branded megacorporations. Data, customers, brand, employees, law suits, or cynically, human lives.
The risk is being managed at the VC/investor level, by diversifying investment bets over numerous early ventures.
The death of any one of those isn't a concern for the VC, if the portfolio performance is sufficient. Of course, for the individual venture and employees, that risk is disaggregated.
More rigorous systems practices are seen as an impediment to early growth with any potential problems either something that can be ironed out later, or simply a post-liquidation concern that doesn't factor into the investors' interests at all.