Most frequent users start off as infrequent users. By discouraging infrequent users, you prevent formation of frequent users. That's the business argument. Per

Most frequent users start off as infrequent users. By discouraging infrequent users, you prevent formation of frequent users. That's the business argument. Personally, I just hate it when I click a google link and land on a blurred page. It's deceptive to promise an answer and then make me jump through the hoops before telling me what it is, all of which happens before I even know if the answer was good.