There is no scam(ming).
When you sign up for an Adobe plan, you also agree to the 'Adobe Subscription and Cancellation Terms':
https://www.adobe.com/legal/subscription-terms.html
Depending on what plan you choose, there may be a cancellation fee involved:
https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html
Let's, for example, say you have an annual plan (paid monthly) and decided to cancel way before the contract ends: you will need to pay 50% of the fee for the remaining months.
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