Electric company totally care how you plan to use electricity with different rates for consumers and businesses. What's more, businesses pay different price based on whether they are ok to reduce consumption during peak hours, reliability, etc. Also water company totally cares if you plan to sell car wash services - for one you will have to pay much higher rate for sewer.
I think what sours people is that there's far less grey area in "is this a business" than "is this a server". Businesses are legally defined, registered with the government, and follow a series of rules and standards that often differ from those expected of an Average Joe.
Personally, I find it asinine that setting up my own personal cloud server on a premium internet service is a ToS violation.
