What they wrote is saying the data is available for free, and in fact that they have done extra work to make it cheaper for the LLM, but also says they should "consider" a contribution so support their mission. It's not trying to trick them, it's laying out facts about the value they offer.

And in fact, it's very possible that the person running the LLM would want to be made aware of this information. Or that they have given their agents access to a wallet so that it can make financial decisions like the one noted here around enterprise level donations that could be in the user's self-interest. They might not WANT to sign off on everything.

Is your view that any writing with any eye towards LLMs is prompt injection? That there's no way to give them useful information?