>As far as they are concerned fake and real plays are not much different
This is flagrantly false given that they do care whether plays are legitimate because they do want to be able to verify with advertisers that plays are served to credible clients...
Are you implying that Spotify would expect that advertisers are stupid/inept enough to not notice when a large number of ads are served to fake/bot consumers?
Spotify as a company has the prerogative of acting with integrity in these situations if only for future maintainability/acquisition of relationships with advertisers.
Even if an advertiser was inept enough to not notice their ads were served largely to bots the value of those ads would still ultimately be lowered by them being served to bots. e.g. if 1000 ads are served and 500 are sent to bots, the overall value of each clicked ad is eventually lowered by 50%. This is assuming an advertiser is so inept they aren't measuring clicks per served ad, which doesn't even occur.
I think you're fundamentally misunderstanding why spotify _does_ have to maintain the credibility of those ad clicks/listens/etc...