Investing is just an equivalent value exchange. My point is that while you could say in my example that money just moved around in a circle, it turns out that money moving around in a circle is actually fine.

I agree money in a circle is fine. But in your example there is a straightforward situation of an end customer paying money for a service, eg. getting a sink fixed. The worry with the data centers is will there be enough end customers willing to pay what the data centers cost.