The interesting bit with consent (for EU data protection stuff) is that it has be freely given (so you have to be able to say no), and it has to be informed, so

The interesting bit with consent (for EU data protection stuff) is that it has be freely given (so you have to be able to say no), and it has to be informed, so you'd have to show that the person knew what they were signing up for. 20 pages of legalese is probably not "consent"