If you're burning $40M a year, and you press a button to save $90M a year, yes your label costs are the same but how are you not now at +$50M a year?
Also I suspect that $150k as the mean TC of those being let go is low. Spotify might be saving up to $500k all-in per employee let go.
Probably not low. It's an enormous salary for a developer outside of the Valley and Spotify has plenty of employees which are not in the USA.
I think $150k median is probably on the lower side of correct, but not enough to meaningfully impact any of the numbers anyone is discussing here. It's close enough.
As far as I can tell, Apple/Google/Amazon will always provide the ceiling price for how much Spotify can charge its customers, hence capping revenue, and the 3 record labels will always extract just enough to keep Spotify operating.
Hardware/Software expenses, office spaces, health insurance are fixed cost.
$150k employee vs 200k employee will have the same amount of fixed cost (assuming both are in the same function).
Rule of thumb is that fully loaded cost for US employees is approximately 2x yearly salary (although people who've actually run a company can correct my potentially stale or incorrect understanding).