This is still rent seeking behavior in an industry that pivoted from a live services and paid ownership model.

Nothing wrong with rent-seeking when you actually offer something people want, it's optional, and you don't force them with bait-and-switch (all of which are cases of the bad rent-seeking).

Renting a house is rent-seeking too, for example.

Switching Adobe to a subscription service, on the other hand...

I don't think you can call it rent seeking when it's both completely nonessential and 100% the fruit of their labors. If anything, Spotify is rent-seeking.

how is that rent-seeking?

they actually contribute to the song.