I get that. I think that getting to know juniors outside of work, at a recurring meetup or event, in a setting where you can suss out their motivation level and teachability level, is _a_ way of going about it. That way, if your team is hiring juniors, you have people you have already vetted at the ready.
IMO teachability/curiosity is ultimately orthogonal to the more base question of money-motivation.
In a previous role I was a principal IC trying to mentor someone who had somehow been promoted up to senior but was still regularly turning in code for review that I wouldn't have expected from an intern— it was an exhausting, mind-numbing process trying to develop some sense of engineering taste in this person, and all of this was before LLMs. This person was definitely not just there for the money; they really looked up to the top-level engineers at our org and aspired to be be there, but everything just came across as extremely shallow, like engineering cosplay: every design review or bit of feedback was soundbites from a how-to-code TED talk or something. Lots of regurgitated phrases about writing code to be "maintainable" or "elegant" but no in-the-bones feeling about what any of that actually meant.
Anyway, I think a person like this is probably maximally susceptible to the fawning ego-strokes that an AI companion delivers alongside its suggestions; I think I ultimately fear that combination more than I fear a straight up mercenary for whom it's a clear transaction of money -> code.