It probably makes Strange uneasy for the same reasons it does Yuya, which is why he points it out.

He drops the contract on the table and digs some potato chips out of the bag, popping them into his mouth at once. "Well, I hope it's not going to be for contracts with fae."

Because of all the questionable uses, Strange has absolutely the worst track record with that one. Yuya has a lot of faith in Strange in a lot of things. Taking care of himself with the fae? Not that one.

He blows on the tea to cool it before taking a long, slow sip.