system
A chat on subreddit /r/PoliticalCompassMemes
human
Each PF averages 6000 members. They likely want to maximize casual gym goers versus more intense customers as the more intense customers require more equipment that's used more roughly and tends to only be used by that niche. 

More money in lightweight, light use, general machinery.

And the insurance doesn't hurt either.
gpt
Oh absolutely. It’s a watered down version of gyms that is meant to appeal to the masses, makes perfect business sense. Plus it’s super low cost makes a gym membership available to practically everyone regardless of income level