I think you're hung up on the kindergarden meaning of "sharing." The word doesn't mean "free" -- it only means to subdivide something amongst multiple people.
We use the word "share" in commerce all the time. Time share, shares in a company, profit sharing, etc.
People at pro-airbnb rallies have chanted "sharing is caring". The reason airbnb so assiduously works to keep the word "sharing" in there is precisely because of the kindergarten meaning.
We use the word "share" in commerce all the time. Time share, shares in a company, profit sharing, etc.