Lmao contracts the customer decides if they want a window cleaner not you.
You decide if you want a mobile phone not O2, you decide if you want british gas to supply your leccy or to service your boiler not them, you decide if you want broadband not TalkTalk. Your choice if you want sky TV.
All of those services need a contract, Christ, even my milkman has terms and conditions.
I am struggling to think of ANY regular service that does not require some kind of customer agreement.