Your comment made me think of a web portal for uploading videos, so the content creator uploads once, and selects what content platforms he wishes to share it w

Your comment made me think of a web portal for uploading videos, so the content creator uploads once, and selects what content platforms he wishes to share it with. The people behinnd the portal could have a sign-up page so that any platforms that wish to host a non-exclusive copy can sign up in order for uploaders to be able to select them as well. This could potentially cause the portal hosters (internet archive?) to suffer a lot of upload, but then there are no legal troubles whatsoever (assuming the uploader had the copyrights) in preserving or migrating content. The big networks might refuse to sign up (to prevent such a portal and hence competing content networks from getting a foot in the door regarding network effect), or make it hard to have the single portal entity mediate the uploading to them in the name of the content owner, but in a sense it is not more cat-and-mouse game, but a differently placed one: at upload instead of download.