Why would you say that?
I actually explicitly believe that the FSF and OSI have coopted the term "free" in order to bend it to their own definition, while in fact espousing a position that explicitly advocates for licenses that restrict user freedom in very specific ways.
They, of course, happen to restrict freedom in a way that many folks like. But it's undeniable that, from the perspective of the individual user of software, BSD-licensed open source (for example) affords greater individual freedoms than that provided by GPL-licensed software, specifically because the latter is "subject to or constrained by engagements or obligations".