Lawyer salaries are bimodal for a very specific reason. No law firms really believe that a graduate in the top 9% is worth 160k/year, but a graduate in the 11th percentile is only worth 60k.

But they all have to pay the same because it's a signal to their clients that they are the best. If they paid less than their clients would consider their firm second tier not top tier.

And Google is hiring the same devs as everyone else. Having worked in a large company and seeing several people move to Google. They got some smart devs who stood out on their team, but they also got mediocre devs. The average dev they poached was definitely better than the average dev who worked there but it was a moderate difference in degree not kind.