The problem of "You must create an account to use this service"

Some services (For example, Quora, Zhihu, Taobao and Zhihu) completely prevent unregistered users from even seeing the contents, while most services take the stance which “if you don’t register, you cannot fully enjoy the service” I don’t know if “You must create an account to use this service” refers to the former or latter.

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Most services offer more features to registered users, making it preferable but not mandatory to have an account.
I’d say that the case only applies to the first category you’ve described: only if there’s no way to use the service without an account.
Otherwise, this bad case would apply to all services offering sign up options, and thus would be unfairly penalized.