CNET: "Yahoo cites spam concerns in move to block the instant-messaging service and vows to continue effort if Trillian develops a work-around."

I'm getting really tired of stories like these. Yahoo! is a smart internet company - can't they see a valid business model in developing an IM network that allows third parties to play with the endpoints? Personally I'd much rather take a nickle off of each transaction on an open network than chase dollars on a closed one.

eBay gets this - why doesn't Yahoo!?!