Why is Bill Werde making such a big deal out of this?
Taylor and any artist has the right to keep their music out of any streaming service they want if they think it helps them.
IMO I don't think it affects sales at all for an act as big as Taylord and it's a dumb move from Taylord's part. An average Spotify listener won't feel forced to buy and album just because it's not on Spotify. They will probably find the way to listen to it or not listen at all.