She is, she's actually the most streamed artist on spotify right now, and 3rd most streamed of all time

Other artists here might have specific songs that are miles more popular than their other top songs, but Taylor's streams are a bit more spread out across her discography (i.e. many pretty big hits instead of a couple massive hits, and more likely to have actual fans who listen to her albums in full over a lot of the artists here who probably have 90% casual listeners)