In contract terms, yes it is ambiguous - especially now legislation offers an alternative phrase.

As a consumer, perhaps I think place order means let me try it for 30 days and decide if I want it or if I want to return it. Or some other variation which means I don't expect to have to pay you anything.

Whether I am being deliberately obtuse or not, few traders will want to get into legal nonsense over online orders which are not necessarily very profitable (hence any profit is lost as soon as there is any dispute costs).

If the law offers an acceptable phrase, it is reckless not to adhere to it as otherwise you end up in a court discussing sematics of english phrases rather than whether you are owed money or not.

[edit:typo]