I recently met a local guy that runs a pretty successful commercial snow plowing "management" business. He doesn't own a single truck or plow but has contract with a couple dozen commercial properties like banks, super markets, office complexes etc. He knows the industry, handles everything directly with the customers, but outsources the actual work to local landscapers.
Im sure there's plenty more that goes into it with insurance, liability, contractors stealing customers, etc. but got my wheels turning a little bit. I remember a bunch of successful redditors doing this with cleaning companies back in the day. Wondering if anyone else has some examples they can share.