And the fire safety risks are significantly reduced (thermal runaway is much harder). They can also be transported and stored completely discharged, something not done with lithium ion batteries because of it degrades them much more than regular usage.

I thought Anthopoc’s training was deemed fair used. It was the downloading that was illegal

No, they used to do IQ tests which were found discriminatory (and don't correlate with job performance). Tests and problems directly or indirectly related to the job are not only legal, but are commonly used (leetcode).