Punish the investors by forcing them to price the risk of enforcement by having enforcement apply meaningful financial punishment. On the flip side this rewards well behaving competition giving a real market advantage.
For FAANG this means fines need to be on the order of $100B for something significant.
You might have to do this once or twice but once the risk is real investors will put appropriate pressure on boards, and influential employees paid in stock will have personal motivation.
That won't work because the investors that actually have influence with the board also know exactly the right time to jump ship before slow moving regulators manage to do anything.
For FAANG this means fines need to be on the order of $100B for something significant.
You might have to do this once or twice but once the risk is real investors will put appropriate pressure on boards, and influential employees paid in stock will have personal motivation.