This is a good move. Even though ads are annoying and frustrating at most times it is not anybody's birth-right to use a product/service for free and block their sources of revenue. If they have a pay-to-remove-ads option, use it.
While I'm sure I'm in the minority, I absolutely do have the birthright to control what content appears on my device. If they want to prevent ads from being blocked, blocking me from using their service is 100% fine by me.
Your statement sounds very akin to "fine, kick me out of this party I was clearly enjoying, I don't want to associate with these kind of people anyway..." which feels disingenuous.
I think you really just don't care that much about using spotify, which is a perfectly cromulent opinion.