There are, but the incentives put in place by public companies tend to favor short-term results when they're releasing quarterly earnings, something that some big investors have pushed back against for that very reason. Public investors may not be more corrupt either, but they may be less knowledgeable about the harm they're doing when they make changes to the product to get more revenue, like that infamous investor call where someone suggested charging $1 to make Mario jump higher. Microtransactions are clearly a business model that customers are willing to pay for, so it makes sense that person would raise the question, but I doubt that guy plays Mario games in his spare time, because no one who does would suggest that.