To get to a quality loop that learns from people's actions it has to be useful enough to actually be in their loop.

That's very hard to do!

A quality loop that is on the side can't ever get going.

Typically you have to do it with a different, more quotidian primary use case, and develop the quality loop as the bonus use case.

Over time as the quality improves (hopefully at a compounding rate) it might eclipse the original primary use case.