Hmm? You have the revenue already. I know it's awkward from an accounting point of view, but you already took my money. "Letting" me keep the balance in the account is not generous.
Edit: on re-reading this came out more combative than I intended, sorry. I think what you're doing is reasonable.
At the same time majority of money we pay them usually just gonna be an expense paid to actual inference providers. Then they pay taxes on their fee aka actual profits.
Its understandable, but it dont make 1 year expiration any good.
What a fucking ridiculous thing for me to learn by social news.