Im not sure if I understand this correctly but wouldn’t this prevent other sites from being able to emerge in the future? Basically a forced monopoly on currently popular sites.

We're lamenting the fact that these authentic documentation sites are not the top results, instead being overtaken by bad copycat sites. I'm suggesting not relying on algorithmic improvements to do this and just pinning them to the top, since this is the wanted outcome anyway. The suggestion is not that these pins should be immutable for all time.

I'm not suggesting this be done for commercial sites, just neutral documentation sites for languages and frameworks. This would be strictly better from the perspective of the searcher.

Scale problem? How to do that for 4B sites?

Are there really 4B frameworks or large software projects out there?

I'd argue that simply doing that for the top 10 programming languages or frameworks will make a huge difference and is relatively easy to do. Low effort but very high impact.