The actual expensive part is the internet.

It might use a very small amount of data but the bandwidth requirements are expensive.

Running more than one bitaxe on the starlink creates noticeable lag, running one bitaxe on mobile data makes it completely unusable for anything else.

I am of course talking about an Australian issue that doesn't apply to most people outside of Australia.

In places where the government did not give 100 billion dollars to a corporation to take control over the internet you probably don't have this issue