/golfclap

Yep it’s on their blog

Valve's legal department contacted Nintendo to inquire about the announced release of Dolphin Emulator on Steam. In reply to this, a lawyer representing Nintendo of America requested Valve prevent Dolphin from releasing on the Steam store, citing the DMCA as justification. Valve then forwarded us the statement from Nintendo's lawyers, and told us that we had to come to an agreement with Nintendo in order to release on Steam. Considering the strong legal wording at the start of the document and the citation of DMCA law, we took the letter very seriously.