I believe you can actually.
YouTube has a section where you can pay for movies here: https://m.youtube.com/channel/UClgRkhTL3_hImCAmdLfDE4g
And here is a discussion on how indie filmmakers can get into it: https://www.reddit.com/r/Filmmakers/comments/c01kyd/how_to_r...
There's definitely a higher barrier for movies, but it does seem possible.
The links you provide show that it's still a huge barrier. The requirements for getting onto youtube arn't something you can just do if you have a movie you want to sell.
Even with the unknown ($1500? according to that comment, but no links to back it up) payment to a distributor, there's still almost certainly more hurdles and time/etc.
Compare that to the experience with, say, Bandcamp - their [pricing is transparent and up-front](https://bandcamp.com/pricing), and you can go ahead and sign up with minimal fuss. From a customer perspective, it's equally as pain and hassle free.
The model for selling music is pretty solid, and there are services like Bandcamp that will do the hosting & Transaction processing for you at minimal overhead. Even platforms like Patreon will let you do this directly attaching the file to a post.
People have little issue getting the downloaded music onto whatever device they want to play it on.
Video is harder: filesize and codecs are one issue, convenient playback is another. You can't just use YouTube unless you want to give it away for free.
Vimeo is an option, but the overheads are higher and could easily eat any potential revenue. Playback is a problem - lower device support. It doesn't allow users to download and play offline either, and that would be harder for casual users.