They are doing us a favor, there's no denying that. Just like dozen of other providers did them a favor by providing them with the free software pieces they relied on to build their product.

Of course it's poor taste to add the "You're welcome". But poor taste is par for the course for such startup, unfortunately.

Despite interesting legal definitions, companies are just groups of people.

I also read the title as having an air of self-importance or maybe passive-aggression. If you read it a little more dispassionately then it's just an awkward way of stating that this is a gift.

Why is this a gift? The company does not need to give it to you, though it arguably benefits from doing so. It did so with some definition of "free."