I assume the “enslave” question is meant to allude to the fact that, since nothing is actually free, when demand outstrips supply, at some point “making it free” can only mean forcing people to provide it (financially or personally).
If “x should be free” was a solution to anything, why stop at education? Let’s make everything free!
Are people being forced to provide free public education up to High School in the U.S.? Are they being forced to provide free University education in the countries where it is free?
If something being free implies forcing people to provide it, to the point that "enslaving" them is a reasonable analogy, why have anything free whatsoever? Let's have nothing free!
If “x should be free” was a solution to anything, why stop at education? Let’s make everything free!