The companies (like Meta and Futo) that are trying to appropriate the term "Open Source" are enormous, shitty ass holes.
But also, there's an extent to which as someone who is more aligned with the Free Software movement than the Open Source movement (though fuck Stallman, Moglen, FSF, and SFLC; Kuhn, SFC, and FSFE should be the future of the Free Software movement IMO) that I'm a little glad that the term "Open Source" exists and is mainstream enough that it has been appropriated rather than "Free Software" or "F(L)OSS". It provides a bit of a protective barrier.