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I think that the quiet co-option of FOSS communities by the Frightful Five (and those corporations aspiring to join them) has included a concerted, broad campaign to undermine Copyleft. When I first started doing FOSS back in the 90s, "open source" implicitly *included* Copyleft licenses... more recently, as we've seen the mega corporates barging their way into the space, we've increasingly seen them shifting the definition of "open source" to mean open source code *except* for Copyleft code. Given the disproportionate dominance of the tech media by those mega-corps (all of who have built their fortunes by exploiting users of their proprietary software) I'm cynical enough to think that this shift is not accidental.