Youtube compresses the beejeezus out of everything and has a low bitrate for the sake of keeping cost down because of the insane amount of people it provides content to. The low bitrate is why you see artifacting on videos (that's when it gets weirdly pixelated without having dropped a quality setting). All streaming platforms do it to some extent or another for the same reason but some have what is called "lossless" audio on their paid tiers. Ones that I know of are Tidal and Deezer. I've heard Spotify offers it too on their HIFI service but I don't know the details of it.