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There is a legitimate start-up that basically is outsourcing tasks to a digital personal assistant but they log all questions and their researched answers. It make take a while but they will have a moat within a few years with a really robust repository.

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The problem is that this then becomes a cache invalidation problem. Many of the examples presented will be outdated in 1 year, and completely wrong in 5. How can you know which answers need to turnover and when?

Another startup can provide cache invalidation services for knowledge.

That's definitely one way to do it. Our approach is not to literally run a concierge search engine, but rather build up intuitions on how humans effectively find knowledge on the Web and then build tools to make that easier.

Is that the end-game of the startup you mentioned?

How can users be sure that "results" aren't sponsored?

I imagine that whoever runs such a service would get hounded by paid placement opportunities if it takes off. A similar issue plagues browser extension devs.

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