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Fantastic. All I needed was some more texts/SMSs from restaurants I visit.

Good luck to you guys, but I hope you'll find a way to make this less annoying than I expect it to be.

And please allow for a simple general opt-out.

Absolutely. The general rule of thumb is to not over-text (annoy the customer), give them what they came looking for when they signed up to join the program (generally compelling offers and promotions), and always make it easy for them to opt-out if they aren't interested anymore (every text includes the instructions to "Reply STOP to opt-out" to make that simple).

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