So many things.
Magic the gathering meant so much to me. I hung on to the game as the cards became commodities as long as I could, but when I saw Planeswalkers become a thing, a very expensive thing, I had to get out. Fuck power creep and stop price gouging me.
I liked Starcraft, mostly because it was what me and my weeb friends would play. I didn't even try to play Starcraft 2. I was also big into DOTA, back when it was just a custom map on Warcraft III's Battle.net. Tons of custom games back then that the community made because they were just bored. Tower defense, Golems, it was fun, maybe just for the sole reason that they weren't handing it to you. I play League of Legends now and it's just a huge pain in the ass.
Game of Thones. This one is just me being petty. I can't tell you how much it meant to me reading this relatively unknown fantasy book in school around 2006. I was a geek in the days when being a geek wasn't cool at all. I can't wrap my head around what it would mean to be a geek in high school today. It meant everything to me to read a book about losers fighting to survive in a world that doesn't want them. Now they made a show about it and everyone loves it. Daenerys is not supposed to be that hot. Jon Snow is supposed to be lanky, dorky and have pimples. Everyone's a pornstar. I used to be into it for the whole underdog thing, now I'm into it because Bran's story is the only plotline worth knowing.
Lord of the Rings. Jesus Christ how they butchered this thing. It was cool, it was epic, it was geeky in a world that wasn't. Now they're making 3 whole fucking movies. I'm so disappointed. My subculture has been laid to waste by salesmen.
Deus Ex - You don't need me to tell you how perfect the first one was. The second one was really lame. I didn't bother checking out the third.
I used to believe that only losers were into Superhero Comics. I don't know why I thought that. Anime, Computer Skills, Fantasy Games, Comics and Science-y things all had an alliance together, and I believed it. It really makes me mad thinking about all of it. The commodification of it all swept me off my feet and I had to admit that capitalism didn't respect traditions and people, so I suppose now I don't wave the Geek flag and instead I wave the Anti-captialist flag.
On the other hand it forced me to find new cultures to relate to. I can now talk to black people about hip hop and I like Adventure Time and Steven Universe. But I know that capitalism's gonna come from them too and will milk as much as they can out of it, they'll never let a good story rest.