What does 'Freeze' freeze?

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This has come up a few times and something Monzo plan to implement in future I believe this what @tom said some time ago;

Cancel my subscriptions

We’re definitely planning to help manage recurring payments, which will include both direct debit and CPA on a card. We will forecast what impact they’ll have on your monthly budget, alert you when they change, and allow you to cancel them from within the app. It makes most sense to work on this when we have DD functionality available. Until then, if you’re having problems with a CPA, just contact support in-app and we’ll help out…