[forgottenpass]

This is how Mailgun and their ilk operate

That's because their business model is to facilitate the level of spamming that sits right below the threshold of anti-spam measures.

Of course they're going to help you send out as many messages as possible. That's what you pay them for.

Without saying that OPs approach was the most appropriate solution to their problem, I'll point out that Figma's bottom line isn't directly connected to how many document invite emails they shoot out. That's just a collaboration feature of a larger product.