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Dark pattern abuse at its finest. You find this on all third party webstores that have decided to affiliate themselves with Shop. This has been spreading like the plague and infected a lot of webstores I used to use. If you don't notice or forget to click on the "not now" at the bottom of the page they will create a Shop account that contains your email, phone number and credit card information without further warning. Whoever hacks into their database is going to hit a goldmine. You might have a Shop account without even realizing it right now.
And of course there is a 30 day delay for account deletion for purely made up reasons.
Isn't that illegal in the EU?
Yes, you have to opt in. That's why they'll have you check 3 perfectly fine checkboxes, and then hide one like this among them.
Who cares? The corpos are city-states, now. Try to enforce it.
The EU routinely enforces such rules, with fines that are calculated based on company revenue, so that it hurts equally, no matter how large.