The motivation behind it is very simple: eye-watering salaries in the field. Moneyed people are ready to pay these salaries because a lot of them have succumbed to hype equating "AI" (that phrase alone is complete bullshit) to something bordering on "magic," and bringing equally magical money making opportunities. The prospect for business owners to get rid of white collar workers in a manner not unlike how machines…
For a very broad meaning of "in the field". Academic salaries are kind of meh. The eye-watering salaries you mean are paid by large technology companies and I don't think those hire you on the merit of your publications, only. For example, allegedly google and facebook et al hire drop-outs from PhD programmes in highly rated institutions etc. so people who haven't yet had the chance to change the face of AI with their research, if I may be so bold.