The double negative is incorrect, but perhaps the negative "opt out" is being a bit obfuscated by the "wish". It's been common for these types of questions to

The double negative is incorrect, but perhaps the negative "opt out" is being a bit obfuscated by the "wish". It's been common for these types of questions to say something like "I wish to receive exclusive offers..." So this phrasing is a little bit tricky in that if someone doesn't read it carefully they will think checking the box is saying yes to marketing spam, when in reality it's the opposite.