@logic Not really accurate as the site that the creator chooses to use has a permission-less share button, in fact like many mainstream sites and creators it positively encourages the sharing of links via the options it provides (it's called free promotion) or why provide them at all? If the site didn't offer a share feature and it was somehow being shared then I'd agree with your comment. Also by your logic you presume the creator both knows everyone who shares their links and approves of every link shared, this is both unrealistic and not required.
Essentially if a person doesn't want their content shared or consider it private then should they be hosting it on a public platform that actively encourages sharing?