Why do I need iTunes Match?
What happens if I cancel iTunes Match
iPad Air 2, iPadOS 15
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Any of your content that is currently in the cloud and not on your computers or devices, apart from your unhidden purchases, will cease to be available to you. As long as everything is downloaded/stored locally on at least one computer, and ideally backed up to another drive, there shouldn't be a problem. You will lose the ability to have any playlists or updates you make mirror automatically to any other devices signed into your iCloud Music Library.
tt2