The issue is that "left-wing" itself has changed in meaning. Left-wing in Sally Valley used to mean "affiliated with the Democratic party". The progressive cancer had yet to colonize SomethingAwful, metastasize to /r/ShitRedditSays, and result in #GamerGate nuking the term "Social Justice Warrior" off the face of the map. Free Software projects had yet to undergo reconstructive surgery to attach a CoC, et cetera, et cetera. "have always been left-wing" really buries the reality of what had actually been going on in the left-wing over the tenure of Linux. (Incidentally, "Social Justice Warrior", according to WaPo, was also of 1991 mint, like the Linux kernel...
https://archive.ph/GSkgg )
Sorry for the political spurgery in advance, but I have no other way to reply to this, and tbh I don't have anything to say past this on the subject.
I watched many old political shows during COVID, and none of what you describe is new. I was watching people complaining about similar things 30-50 years ago.
The progressive movement itself has been a thing now for over 100 years.
Reactionaries (this would include a lot of people in this thread and the forum at large) move towards the right wing. This ultimately changes the right wing as many disaffected lefties enter it. The current group of paleocons call it "Cthulhu always moves left" or the "long march to the left". As reactionaries who were previously liberals move into the right and move the right to the left as a result.
Alexander Dugin describes how the West updates the current version of "liberalism" to version N+1 and then exports the old version around the rest of the world, usually by force, i.e., foreign wars. This has been going on since the height of the British Empire, and the US, as the current Western hegemon, has taken up the mantle. This is why when Lord Miles and Co. stayed in Afghanistan, they found loads of transgender propaganda thrown out the back of their compound. Well before all of this, there was a schism between the nominalists and the realists.
Even if I just bring this back to the tech sector. The tech sector itself has been liberalised. In IBM, as a man, you were expected to wear a garter under your trousers to pull your socks up tight (I am not joking). The microcomputer revolution of the late 70s and 80s was itself a form of liberalising the tech sector. I remember watching old stuff from the late 80s/90s where there were loads of groups that were lefty-style anarchists, transhumanists and all sorts of other misfits. Sure they weren't of the Troon kind, but nonetheless many of them had extreme politics. FFS, Stallman himself believes in depopulating the Earth of humans to save Mother Gaia.
So when I say "You've only just noticed", it's because it's been going on for a very long time (both in the grand scheme of things and with tech).