Spotify’s algorithms try to detect your gender as part of the profile they build about you. The training data will be all cis people and so trans people are likely going to get matched against their AGAB. This really sucks for trans people to have some system they have no influence over constantly serving them ads and music targeted at an identity that causes them distress.

A trans woman constantly getting ads for dollar shave club, Nivia for men, and Weezer is hugely invalidating simply because some machine learning algorithm says she sounds like a man. Good god imagine having to perform a stereotypical version of your gender identity for your phone just to get the recommendations you want.