The only reason You can watch any video for free on Youtube at all is because Youtube chooses to let you do so. It is not a public forum for debate, it is a business.
Not sure what You mean. Do You mean Youtube use other business’ wires, electricity, and services that Youtube pays for to provide You with free videos?
You could go lots of places with it. Tax breaks wherever they build and locate anything physical, section 230, and yeah everything else infrastructure that they use and rely on. Protocols, open source, gov technical bodies etc.