Well the focus on text content isn't the only technical difference here. Google is obviously weighing hundreds of signals in its search results that your engine is not accounting for. These omitted signals are also relevant.
Google is actively fighting the spread of disinformation. You can see this clearly in the forced row of COVID PSA links on the YouTube front page that's been up for the last year regardless of whether you have any history viewing such content. There is manual intervention going on to prevent the garbage their normal algorithms will automatically surface. This is the greatest tragedy of the internet in that it allows people with crazy notions to find each other and build echo chambers with the aid of unbiased ML.
Certainly. And sometimes they're relevant in a good way, sometimes in a bad user-hostile way. Every search engine rquires discrimination and intelligent usage by the person doing the search, just in different areas.
Right, but that is still a technical decision on their side. They presumably don't sit down and have a meeting about what world view they should present. Well I hope they don't.