Because many degrees are pointless, altering institutions into degree factories without adding value to the student. Uni wasn't supposed to be easy, but to cater for the broader population, content has been dumbed down, standards lowered, with the consequence that the degree is devalued.
http://www.radioaustralia.net.au/international/2017-11-29/university-students-dropping-out-in-record-numbers-federal-government-says/1719700