I agree, and just as important as weight/reps and number is the speed of reps. Muscle growth comes from the amount of time the muscles are being utilized under weight. If someone cranks out 10 bench press reps quickly, that will have vastly different results than a 3110 lift. (3 seconds up, 1 second hold, 1 second down)
Interestingly, the list lower on the page that has companies from 1300 to 1399 is twice as long. Does anyone know if something significant happened in the world that leaves so many more companies from that century around?
A great book that touches on the subject is "Musicophilia" by the late Oliver Sacks. It goes deep into the neurology of conditions like acquired savant syndrome, though the core of the book is on music-related neurological anomlaies
https://www.amazon.com/Musicophilia-Tales-Music-Revised-Expa...
As a recent graduate, I know many people who used the "free work for a short term" method to get in the door for a new job. It isn't going to work at very large companies, but at startups and agencies, absolutely. "Illegal" sure, but a smart manager wouldn't turn down a chance to get a great look at a potential employee