If you are an investor who owns 30% of a business and the founder owns 70%, how do you prevent a situation where the founder decides to always take profits and not reinvest them to grow the business? Eventually, as an example, the founder uses the profits he took to start and focus on another similar business, which he will own 100%. Then leaving the business that you're part of on a plateau.
You can't. As a minority shareholder, the majority shareholder can always outvote you.
The only exception would be if the principal shareholder is misusing company money, for example by syphoning money away from one company to another company they own. In that case, you would have to take legal action.