Here's an example of something that is very important and desirable to me but doesn't exist anywhere else on the internet.
By the way, Diamond Harbour is fantastic. What other music do you love?
You should check out the Growing Bin web store - there are some fascinating musical rarities and curios there. There’s some great stuff on Jamie Tiller’s label Music From Memory. His mixes (available on Soundcloud) are also excellent, as are those on the Red Light Radio Soundcloud. I could go on...
In your case, the vinyl record is the other source. Not to mention the other one provided by the other respondent. And a vinyl record is a great source to have -- it will last a lot longer than any other digital link to a stream of a record, if cared for properly.
The people behinnd the portal could have a sign-up page so that any platforms that wish to host a non-exclusive copy can sign up in order for uploaders to be able to select them as well. This could potentially cause the portal hosters (internet archive?) to suffer a lot of upload, but then there are no legal troubles whatsoever (assuming the uploader had the copyrights) in preserving or migrating content.
The big networks might refuse to sign up (to prevent such a portal and hence competing content networks from getting a foot in the door regarding network effect), or make it hard to have the single portal entity mediate the uploading to them in the name of the content owner, but in a sense it is not more cat-and-mouse game, but a differently placed one: at upload instead of download.
You upload your music, and they put it on the various services for a fee. Including YouTube if you select it.
(Cynic, who me?)
We don't watch "important and desirable media" in YouTube (and most of us, not anywhere else, there). What we do watch is not really available elsewhere (e.g. certain vloggers, tutorial videos, etc).
I follow ~360 YT channels, I desire them very much and they are not uploading it anywhere else.
Nonetheless, I am sure that you could live without any of the content hosted on those YouTube channels. The word "content" is a fair terminology in this context since if any media is so pigeonholed as to demand being streamed and served from YouTube, it must not be that artistic, thoughtful, or useful to most viewers. YouTube doesn't optimize for utility, art, usefulness, tact, expression, or value. It optimizes for addiction.
We live on the internet, a place of infinite possibilities and uses. To suggest that it is natural, convenient, and appropriate to pigeonhole our services in this manner is thoroughly antithetical.
More often that not, that's the choice I make. You make it too hard or intrusive for me to see your content and I stop taking part.
And it's funny, a lot of the time when I do this, I'll see a news article pop up a week/month/year later that said content provider is adjusting its policies, seemingly indicating that others are independently making the same choices.
This has happened several times, most notably when I cancelled our Dish junk right before the big "cord cutter" boom. Stop participating if you do not like it. You will survive.
YouTube while it may contain a lot of video of content is really actually pretty poor product IMO. Lots of buffering, lots of ads, the apps have terrible UX as does the website and now that google is becoming less and less trustful (some would say always were but just becoming more evil with more data) I welcome video content hosted elsewhere. I really like Vimeo not just for the performance and video quality but I also find the interface quite good to use, it would probably need some adjustments if it were to take on the amount of content YouTube has.