Oh, they were absolutely in peonage, but they were not in serfdom. People today with shitty jobs and mortgages are in neither. That being said, I absolutely agree that there are negative trends, I just wanted to speak to them directly without using flawed analogies that serve little other purpose than to evoke "cold & prickly" feelings in their listeners, to borrow a phrase from John Michael Greer. The term serf refers to something very specific and utterly alien to the experience of me or you or Kepi, and referring to our situation as being worse is comical at best. Poor laws and sharecropping systems fit the definition much better (though not perfectly), as the defining feature of serfdom was the status of being bound to the land.
The example is flawed. The relation between a dolphin's flipper, a bat's wing, and a human forearm is one of common origin, not function.
Homology, not
analogy as you are trying here.
And if you really wanted to look at the positions in our society most analogous to serfdom, you would have to look at the status of illegal immigrants and guest worker programs. Which is not what I think people have been referring to.
Black people, particularly between the Civil War and the Civil Rights movement. And American Indians could be Adivasis.
PS Attempts to play a gotcha moment, where the answer is "women" or "gay people" or something else that does not fit the description will result in negative performance reviews.