I have seen many people thinking that Google changed its service from GPM to YTM because it can pay less for artists. But that's not true. Here is the source:- https://soundcharts.com/blog/music-streaming-rates-payouts
A line from the article:- Youtube is a multi-sided platform in terms of payout. There are at least three separate payouts under the brands’ umbrella: per YouTube Red/YouTube Music stream ($0.008), per video-stream on the official artist’s channels ($0.00164) and videos monetized through Content ID ($0.00087).
So YouTube Music pays $0.008 and next is Apple Music which pays $0.005 per stream. Anyhow Napster, Tidal and Amazon Music are best in terms of paying to artists.
Still it doesn't change the fact that YouTube Music app sucks in usability comparing to GPM.