[ckastner]

> Of course I agreed, but its all their fault because I didn't know what I agreed to

This might sound counter-intuitive at first glance, but nevertheless can make sense, legally speaking.

Let's begin with an extreme example: Say someone holds a gun to your head, and forces you to sign an unspecified agreement. In that case, undisputibly, it is all their fault, and you don't know what you agreed to. Clearly, this would not be legally binding.

Well, there are less extreme examples which also lead to results that are not legally binding. Sometimes, these are part of consumer protection laws. In some jurisdictions, these might even be part of common contract law.

Or, to use the best example: "agreements" of this sort will almost certainly be null and void under the GDPR.