That's quite the leap you made there to get dramatic about LLMs takin' our jerbs. It seems to be a trend...

Support is not likely it, it's not the type of app that requires a lot of human support in the first place, tbh, I'd be surprised if you can even talk to a live person. Even if it was support, those would probably be the lowest-paid employees and not help much in cost cutting. Not sure what a LLM would even provide for Spotify support that a static FAQ couldn't.

Speaking purely from the dev side, a competent 5-person team could probably build 95% of Spotify’s current functionality in 2-3 years. Of course there are many other necessary nontechnical roles that would be unfilled (legal, business development, etc).

It’s no secret that companies tend to scale their workforce exponentially in exchange for logarithmic gains in their core product.