I don't think it's so much that they rarely collide, it's more that the game industry is NDA-infested. Gaining a public profile as an employee for a developer w

I don't think it's so much that they rarely collide, it's more that the game industry is NDA-infested. Gaining a public profile as an employee for a developer working on a game for a publisher is a risk. People get fired for lesser things than talking about how Lua helped them in Project X. Spreading knowledge between game developers is easier, though. People move around between companies a lot, and your publisher's team of lawyers is less likely to be present at a conference talk than finding NDA violations by crawling the web.