I think some people downvoted this question of mine, so I’ll try to clarify my thinking.
Google is paid by advertisers to refer people to their content.
I was paid Wolt credits by Wolt to refer people to their service.
It seems to me that providing people with a promo code that they find valuable, and that Wolt finds valuable is providing a similar kind of value as Google’s own advertisements, even if mine is minuscule, and even if I use Google to advertise it.
