If you post a video publicly on YouTube then you expect that anyone can stream it. One could quibble over whether you intended for anyone to be able to save the

If you post a video publicly on YouTube then you expect that anyone can stream it. One could quibble over whether you intended for anyone to be able to save the video since the site places some minor technical obstacles in the way (plus the ToS visitors are supposed to agree to), though it's hard to argue that you weren't at least aware that it could be done easily given well-known tools like youtube-dl. If you upload your content to IPFS there are no obstacles to downloading, and no ToS. It's like hosting the file on your own site with no restrictions, except that the system is explicitly designed such that you can't take down anything that's been published. That makes it hard to complain about people saving the content; you've basically given everyone an implied license to access and pin the files. Republishing outside of IPFS might be a problem, copyright-wise, but since anyone can get the files from IPFS directly that isn't a major issue.