The barrier is copyright law and fear of lawsuits. They intentionally make it difficult to save video so that the platform can be used to control and monitor your access to the content. There is big money tied up in this.
But yes, it does vary by website and content. Browsers and website operators do not have to force content to be encrypted and streaming-only, but the technology to do that is there for those who want it, which is most of them.
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