That's an oversimplification. Yes, wealthy individuals inevitably have more influence. But there are numerous countries whose governments regularly act against corporate interests. For example, as much as I dislike GDPR, it is a strong example of governments implementing a policy that is explicitly against corporate interests. Another example is the OECD global minimum corporate tax.

So, there are governments that oversee capitalist countries that are willing to implement policies that hurt corporate interests with the goal of helping consumers. I'd say the problem is that often these policies made with good intentions, like GDPR, end up being poorly implemented and therefore harming consumers as well as hurting corporations... but that's an entirely different problem.