edit: Surprised by the negative reaction to this post. At least 5 downvotes altogether. I'm not endorsing Monyneux's actions in any way. I'm just saying that it's obvious what happened. They promised royalties on a product they failed to deliver for business and technical reasons. Now they are pivoting to a new game to try to stay in business.
They should have owned up to it, and given the kid an apology, a check for 1000 GBP, and modelled a character in "The Trail" as damage control.