Same.
Any app that decides to use the AppStore to only steer you to their purchase option deserves contempt.
There won't be cheaper apps. That's nonsense. The devs want more of the payment.
The little app devs have been happily making money that would have been impossible in the old physical store only days. All the tools, the marketing, the buyer safety, the regular updates, the seamless payment and refunds, the reviews... the whole ecosystem worked for them.
Anyone who think Spotify is going to charge less for a sub through the app is kidding themselves.
Apple currently host the Spotify app and get nothing.
If you cant work out how to subscribe outside the app store perhaps technology is too complex for you.

This isnt going to result in a huge increase in Spotify subscribers.
Most people have woken up to the fact they havent kept up with other streaming services on quality of audio, Airplay and keep raising prices (while paying music rights holders the smallest amount).
Spotify will now start complaining about the new fees to run the app...
Wait until it costs them more to have Apple host an app that costs them for each download... that they currently get for free