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Julie needs a senior citizen to go undercover in that “closed ecosystem” — that is, closed to her — to collect information, identify suspects and report back.

It is, effectively, a closed ecosystem and that keeps it secure.

Many vendors have business models that do just the opposite: create a closed ecosystem so that the client would have difficulty integrating with competing products.

And I don’t want it to happen in my lifetime, because I’d love to see us do the research first to make sure everything is safe—you know, have a research station on the moon for a couple decades where we work out, for instance, “Are rodents okay reproducing in space?” and “Can we make a closed ecosystem where the parts don’t break for more than two years, so we know that people on Mars will be okay?”

One can see why Musk would like Twitter to be more of a closed ecosystem where its users are happy spending more time.