Not calling Young a terrorist, I'm using the term "don't negotiate with terrorists" loosely - the point is, when two peers in a network end up in a situation where one is making a violent ultimatum about both of them, the moral high ground is automatically biased in favor of the victim of this ultimatum, not the one who threatened it.
The principle of "don't negotiate with terrorists" is applicable far beyond literal terrorism and I think it's exactly the moral calculus necessary for Spotify to reach the conclusion they did. Network members who think they can yield violent ultimatums to control the administrating entity are toxic to all of their peers.
Spotify is not treating Young and Rogan as peers; only one of them has received an exclusive multimillion contract and extensive promotion, and it isn't Young. Spotify have taken an active decision to promote Rogan, and it is entirely correct that they face consequences for that decision.
Not all violence is physical. Violence is what you use to force people to change their behavior. There are many forms. Verbal, psychological, social, economic.
I agree with you that it's not terrorism, however.
Violence is a word that is ambiguous for sure. I would still say that it is a long road from most definitions of violence to Neil Young saying that he will remove his music from Spotify if you let Rogan host his podcast there. I mean most negotiation in some way or another uses force but that does not mean it is violence.