It's absolutely insane to me how bad the user experience is with video nowadays, even video that's not encumbered by DRM or complex JavaScript clients.
Has nothing to do with video per se. Normal embeddings, using the standard `<video>` element and no unnecessary JS nonsense, still work the same way they did in the 90s: Right click the video and download it, it's a media element like any other.
The reason why user experience is going to shite, is because turbocapitalism went to work on what was once The Internet, and is trying to turn it into a paywalled profit-machine.
Then once you've found a codec, the other problem immediately rears its head: video compression is pretty bad if you want to use a widely supported codec, even if for no other reason than the fact that people use non-mainstream browsers that can be years out of date. So you are now dealing with massive amounts of storage space and bandwidth that are effectively being eaten up by duplicated files, and that isn't cheap either. To give an estimate, under most VPS providers that aren't hyperscalers, a plain text document can be served to a couple million users without having to think about your bandwidth fees. Images are bigger, but not by enough to worry about it. 20 minutes of 1080p video is about 500mb under a well made codec that doesn't mangle the video beyond belief. That video is going to reach at most 40000 people before you burn through 20 terabytes of bandwidth (the Hetzner default amount) and in reality, probably less because some people might rewatch the thing. Hosting video is the point where your bandwidth bill will overtake your storage bill.
And that's before we get into other expected niceties like scrolling through a video while it's playing. Modern video players (the "JS nonsense" ones) can both buffer a video and jump to any point in the video, even if it's outside the buffer. That's not a guarantee with the HTML video element; your browser is probably just going to keep quietly downloading the file while you're watching it (eating into server operator cost) and scrolling ahead in the video will just freeze the output until it's done downloading up until that point.
It's easy to claim hosting video is simple, when in practice it's probably the single worst thing on the internet (well that and running your own mailserver, but that's not only because of technical difficulties). Part of YouTube being bad is just hyper capitalism, sure, but the more complicated techniques like HLS/DASH pretty much entirely exist because hosting video is so expensive and "preventing your bandwidth bill from exploding" is really important. That's also why there's no real competition to YouTube; the metrics of hosting video only make sense if you have a Google amount of money and datacenters to throw at the problem, or don't care about your finances in the first place.