The checkbox is usually checked by default (it's a Shopify setting), in many jurisdictions (like the USA). "It" was probably an "abandoned checkout" email, which is a transactional email, and is legally allowed.
I use this Shopify feature as a buyer to get discount codes, as abandoned cart emails often come with them.
Comments
No, I've received it just from entering my e-mail and nothing else. So many companies don't care, or don't know.
Either way, if I enter my e-mail, decide "nah" and quit, that should be that. It shouldn't be sending my details in the background
The checkbox is usually checked by default (it's a Shopify setting), in many jurisdictions (like the USA). "It" was probably an "abandoned checkout" email, which is a transactional email, and is legally allowed.
I use this Shopify feature as a buyer to get discount codes, as abandoned cart emails often come with them.