Hi there – I’d recommend taking a look at this post in our community from people asking for similar functionality: https://community.klaviyo.com/integrations-and-reviews-39/woocommerce-subscribe-to-newsletter-checkbox-at-checkout-303
In general, we recommend keeping your email subscription box on your checkout page?unchecked?by default to avoid damaging your sender reputation by accumulating passive subscribers. Leaving this box checked by default is usually not a recommended practice because it can lead to people who don’t wish to receive marketing communications from you getting added to your list. They are more likely to unsubscribe, ignore, or mark your emails as spam.
