>Often they will put in things that they know aren't enforceable because they hope people won't try to challenge it in court. There are contract laws, consumer protection laws, etc. that still must be adhered to.

Which is why a "severability clause"[0] is pretty ubiquitous in contracts.

N.B.: IANAL

[0] https://www.investopedia.com/terms/s/severability.asp