They represent an urbanite 20-something's version of diversity. I appreciate the effort, but I noticed that it rarely represents characters of different ages or styles.
This is very low on my list of grievances though. I like those vector characters quite a bit more than the stock photos they replace.
"Here we love people, even if they have enormous hands!" https://pbs.twimg.com/media/EbWYR4lWkAEOgAo.jpg
"I don't care if you're white, brown, black, orange, or purple!" https://eyeondesign.aiga.org/wp-content/uploads/2019/08/Aleg...