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Google, eBay, Wikipedia, YouTube, Stack Exchange, and DuckDuckGo fit nicely with the concept of “type search in form, get list of links, video, article, QA page, etc.” HomeIdea3D tries to emulate/replace a desktop application. This is the type of tool that I would allow a SPA for, even though I normally browse with JS disabled.

HomeIdea3D.com is a real app with complex state and stuff so an SPA makes sense here.

YouTube is indeed a SPA.

YouTube is not really a SPA as in React or Vue. It looks like they use something similar to TurboLinks or Intercooler: https://youtube.github.io/spfjs/

Edit for downvoters: Ok, technically, YouTube is a SPA. What I meant, in the context of this discussion, is that YouTube uses a technique similar to what GitHub does, where the server returns fragments of HTML.