that doesn't give them the right to detain you Nobody's arguing that they have a power to detain you without probable cause, but they can (and have, many times

that doesn't give them the right to detain you Nobody's arguing that they have a power to detain you without probable cause, but they can (and have, many times) cancel a membership for noncompliance. But to say there is "nothing there" in the agreement on the topic is disingenuous. Of course, those who aren't members anyway aren't really risking anything.