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If you want to provide customers with an option to join your mailing list within the Checkout flow, now you can.
Simply go to Settings > Website > scroll to the bottom and you'll see this new box:

Rather than forcing everyone into calling their mailing list a mailing list, you can insert your own naming convention.
Eg. "Join our mailing list" or "Join our newsletter" or "I'd like to stay in touch" or "Keep me up to date with news and offers"