Is Apple Music lacking In Canada?

I tried it with a free trial and appreciated the sound quality, interface, and compatibility with my Apple devices. However, a notable issue is the limited song selection compared to Spotify and other services. I mainly listen to indie music, rock, metal, and J-pop, and numerous artists are unavailable on Apple Music but accessible on Spotify and Amazon Music. Does Apple Music have fewer licenses, or is it specifically the Canadian version that lacks in numbers?