I agree, better to discourage that. If it is something you're selling in your business, why would you give a direct competitor your recipes?
Right now I make mostly chocolates and dessert minis. If a chef I knew and liked needed a recipe for ice cream or focaccia or something peripheral to the business, I'd share. If my competitors want to copy me, or if I want to copy my competitors, I think it's up to us to figure it out.
Would it be an option to sell to those items to them or trade product as part of your rent?