Site Apps as response to browser bloat and lack of functionality

Face it, the criticism about "Apps" for every website would be far more relevant if Apps weren't much faster and resource efficient than browsers. Browser bloat fragmented the web, mobile devices turned to lightweight apps and secure app stores.
Another aspect is extensions/plugins being replaced by safer but more limited "WebExtensions" which are slower and less capable than site-specific apps.

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example.com/gay-niggersTsk.-from-outer-space.avi is not compression.

Technically you are correct. But for all practical purposes, you are using a 0.2KiB identifier instead of the 4GiB film. This achieves exactly the same goal as compression.
If you are still unconvinced, think of it like this: The compression algorithm is a mapping from the minified ID to the full resource. If we have a finite amount of resources, we can put the mappings in the compression algorithm definition. Then the algorithm is simply switching on the ID and returning the corresponding resource.