CBS Themselves when They released TAS on DVD back in November of 2006.
It first appeared on the Official Star Trek site (as canon) about a month before that.
To be fair, CBS declared TAS canon so that more people would buy the DVDs (as in, the people who actually care about canon.) Before that they didn’t give a flip whether TAS was canon or not. But because CBS owns Star Trek in its entirety, it’s their right to do so, no matter what their marketing department’s reasoning was. CBS has a habit of declaring things ‘canon,’ ‘prime,’ etc. so more people will buy their product.
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