Scale. A restaurant can only serve 100's or maybe 1000's of guests in a single day.

Spotify has Millions of subscriptions. 2% at scale is significant.

Here is their recent Q3 earnings report: https://newsroom.spotify.com/2023-10-24/spotify-reports-thir...

Their revenue was 3.4 Billion Euros at 2% they can take away 68 Million dollars. Which is more than enough for the business to be viable.

For the same reason you buy nicer toilet paper for your home than the stuff you find at a truck stop: it’s not a significant portion of their expenses.