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Never owned any Apple product so I have no clue what those subscriptions are, but could one person have several of them? And business phone?

The main subscription products are Music, TV, Arcade, Fitness, News, and extra iCloud storage.

Don't know how they count Apple One subscriptions for this, it bundles all six of those into one package.

I think AppleCare warranties are also sold as a subscription now, so those might be counted too?

Subscription is a pretty generic term and it means the same with apple as it does everywhere else.