[kajic]

OP here.

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.