Your key, for your server
Put your own API key on someone else's bot, for one of your servers. Everyone
there can then use that bot without bringing a key of their own — you're paying for it, so
it's your provider's bill and your spend limits. Anyone who has set their own key still
uses theirs. The bot's creator never sees the key and pays nothing; they can switch this off for
their bot, and it stops working if your plan lapses.