They sit on boards and tell the company how to run itself while, in many cases, not knowing a fucking thing about that company's business or industry. A lot of these people are successful in business and that's where their gambling money investment money comes from, but then they invest in different industries they don't understand.
For example: of the dozens of potential gene editing biotech companies out there, Intellia Therapeutics was the first to actually present a working product to the world. Even then, Intellia is currently in a legal battle with three or four other companies over who gets to do CRISPR gene editing - so imagine being an investor in Intellia, sitting on a board meeting where the CSO (Chief Scientific OfficeR) says they've done it, but now you have to keep dumping money into this fucking company over the equivalent of copyright claims. A lot of these investors are young, dumb, and full of cum money. An older investor would ask "so when does this turn a profit?"