The archival is done on someone else's computer, so someone will have to pay for storage and the services for making it publicly available. And even the person that believes everything should be free will start reconsidering once the instance's bill arrives.

My suggestions are either making it available 1) on a self-hosted Peertube instance, 2) on an instance after an agreement (potentially even a financial one), but that requires reaching to the admins of each instance considered, 3) through torrent, 4) on archival sites like Internet Archive, 5) on more profit-oriented Youtube competitors like Odysee and Rumble if your friend must avoid Youtube, as those could probably endure a few potential TB of data more.