User blog comment:Gardimuer/BioShock News Roundup/@comment-2250991-20111002091948/@comment-2250991-20111002230329

I think those restrictions happened when IG joined with 2K to publish BioShock, because before that, a lot of games made by IG relied on voice work by developers and anyone in the company. If even Levine or anybody from IG will act in BioShock Infinite, I'm certain that they'll be covered for any of their work.

Speaking of which, here's IG artist Robb Waters providing the voice of Tombstone in Freedom Force vs. the Third Reich.

http://www.youtube.com/watch?v=r6avH3_8FYQ

I think because these are developers, union laws wouldn't restrict them as it would for a regular voice actor.