It can be very tough to detect: for instance Big Tech has bazillions of proxies or "friendly" companies/corps, and while "in power", they just have to do that:

It can be very tough to detect: for instance Big Tech has bazillions of proxies or "friendly" companies/corps, and while "in power", they just have to do that: be careful that no significant and efficient regulation is setup (for instance noscript/basic (x)html portals for all "utility" online services, where reasonable). Not to mention: how do you legally "track" where politicians are going after their mandate? Do they have the obligation to publish their source of income or wealth after their mandate for a significant amount of (10+) years? And how to draw the lines between "right" and "wrong" in order to decide to seek justice. For instance in my country it seems a politician was involved in facilitating some russian gaz stuff, and with the war for ukraine, we all discovered he was a high level executive in a gazprom proxy. He had to leave because of the war, and it is only because of that that we found out. You can easily extrapolate that case to others, and most won't probably be detected unless there are people/orgs actively tracking them and their resources for a significant amount of time.