[gramontblanc]

Games are a pretty interesting category of software in that they're possibly the only interactive software a user would voluntarily use for its own sake. Anti-games policies and agreements seem pretty suspiciously like "you can write any software you please as long as nobody ever uses it". Perhaps open source software development was only ever allowed under the assumption that open source software could never build a userbase competing with parent companies.

Competition could be pretty broadly scoped -- a hobby game could be dangerous to a tech company if it makes no money and has no special proprietary technology but concentrates enough technical acumen and useful experience in its developers/audience that they could recruit internally to found new companies.