How do people use social media codes?

I am building my audience, email list, Instagram following X etc., and I am curious how people effectively use social media promo codes? In my mind I want to use them to drive early purchases of new releases, with the hope that these early purchases will support my early ranking momentum. But I’m curious as to how and whether and why that is different from the search find buy Service providers which of course are not within TOS anymore

How are people using social media promo codes? And if I market my new product launches to my email list with an 80% off coupon to induce early purchases, will that help my rank or no?