1% of world population have more than $1M. That will be almost 100M people globally. I don’t see how you can own anything substantial (eg datacenter, power plant, factory, etc) if you have less than 100M net worth, hence my original question.

So you can own whole percent of something substantial.

It seems to me that when people use the term "rich" they generally mean some combination of "wealthy enough that you don't have to work" and "wealthy enough that normal rules don't apply to you"[1].

In modern America, $1 million isn't enough to not have to work outside of small towns and certainly isn't enough that the rules don't apply to you.

[1] I don't even necessarily mean big things like hiring high power attorneys to get away with crimes. I mean things like cutting through bureaucracy, access to influential people/resources, the ability to bend regulations, etc.