Earlier quoted context omitted.
Are jobs where developers make $7k per month that common in Poland, though?
Not as common as I presume they are in Sweden - nowadays most job contracts for individual contributors without significant seniority or additional duties fall short of that (~6k gross or around 8k cost for employer), although with covid they are seen more frequently. I was mostly surprised to see Spotify in particular not paying more.
Music streaming is probably not even a especially hard technical challenge. Quite low bandwidth, open source audio codec and no real time syncing requirements between users. I guess most SWE work is in DB management, cataloguing music or fixing phone vendor bugs in the Android app.
Why would Spotify pay eg. twice what Ericsson, Volvo or Scania pays to reach parity with Apple, Tesla or whatever big truck manufacturer there are in the US.