For those who are interested in the legal and policy aspects of this, I highly recommend a book called Boilerplate by Margaret Radin. This is just one of many examples of comically abusive and bizarre contract terms that companies impose by imaginary consent.
Without doing the research, it wouldn't surprise me if the extent to which these clauses were enforceable varied state-by-state. States tend to diverge a lot on these kinds of "unenforceable because against public policy" arguments.