https://support.apple.com/en-us/HT201616
No DRM for iTunes Store where you can buy music.
Apple Music a streaming service, and that is DRMed (I believe).
Apple music is streaming service. But the downloaded files are DRM protected. I know this tool (https://www.audfree.com/drm-audio-converter-win/) can bypass drm easily.
The whole digital music industry has left DRM behind - I buy my music losslessly and from a number of stores without any strings attached. Of course this can only apply to purchasable content - streaming service obviously need to rely on DRM.
Apple Music (the streaming service) has DRM IIRC. But iTunes used to sell DRM-laden music in the mid-2000s and about 10 years ago they stopped. You can download all of your iTunes songs as MP3s right now.
Edit: Looks like the M4P format was mainly on older songs pre2009. Though I see forum threads with people saying that they have to re-pay Apple w/ itunes match to get the drm-free version.