I'm not really sure I'd call Oldhammer countercultural. Maybe a little? I'd say it's mostly a bunch of us still playing the nerdy games of our youth in one form or another. Even by the time I first got in I bought some of the stuff, including my first box of beakies, in mall bookstores like Walden Book and B. Dalton, which were sort of the 80s counterparts of Barnes and Noble. (There were no GW stores in the US at the time, so your options were book stores and hobby shops of various sorts. And when I was a teenager stuck in the suburbs, so the mall was easy.) There was certainly a countercultural elements to it at its origin, much as there was to D&D, but I think it was really more kids being kids than anything genuinely anarchist. Most of my gamer friends were literally boy scouts. Deeply countercultural there, swearing oaths to help your neighbor and uphold the law right before you roll the dice to see who kills the goblin.
Which is to say while GW might have been countercultural when they conned Gary Gygax into letting them license his game, by the time they released Rogue Trader they had grown into their sharp suits running a company that was shipping millions of units on multiple continents. And the punk aesthetic was just a gloss. (Which is probably mostly all it ever is. And all it really needs to be. Art is its own justification.)
As to Cyberpunk corporations (or megacorps, if you will) they're very much a staple of the genre. The fiction is dominated by computers, hackers, and a staggering gap between the wealthy and everyone else, with the wealthy generally living and working in walled fortresses isolated from the masses. Silicon Valley looks more and more like that all the time. Meta is absolutely the epitome of the sort of corporation envisioned as the engine of the dystopian future predicted in most of the Cyberpunk I've read and seen. The megacorps aren't punk, really. They're the suits that make everyone else poor, leading the poorest of the poor to go punk and try to break the system. Which . . . kind of sounds like the world we live in now. Some of those campuses, including Meta's if I'm not mistaken, are literally walled compounds. The people running them live in gated neighborhoods protected by armed guards. Maybe "punk corporation" is an oxymoron, but "Cyberpunk corporation" summons a pretty complete and fully formed image of . . . Meta. Or Alphabet, Microsoft, Bayer, Boeing, J. P. Morgan Chase, even Anheuser-Busch . . . take your pick. Even things as punk as liquor, guns, and ammunition are owned by the suits at the megacorps now. There's no escaping AB InBev, Colt CZ, and the Olin Corporation. You could buy a different round (of either kind), but it'll be just as corporate. The suits will have their due.
Anyway, don't mind me. Don't know much about Insta as I've never been there, but it makes sense that a site dedicated to photos would be popular. And I can't imagine any other site would be any less controlled by some Silicon Valley oligarch or other. All of this stuff settles into a few big players and a bunch of small, specialized stuff slowly living, dying, and being bought out by the big players eventually. That's just the nature of capitalism. Even games have gone that way. (GW just happens to be one of the big players. They and Hasbro/WotC are probably the two biggest, with a bunch of smaller companies dancing around the edges.)
