Pro content makers are in for the money, if you allow links it also comes with lots and lots of great content (frome them who get serious about making money). Is simple, if you want to get massive clicks without fighting the eternal and hopeless fight agaisnt anti spam algorithms, you have to upload great content to build a massive audience.
Pro networks are starting to sprout all over the place in facebook, just as it happened in youtube. Allowing links, and esentially to make money, will bring you lot of spamers (but they will worn you out little by little if you're one) but it also brings people who are willing to do heavy investments in content creation.
I think is a smart move if it comes with great anti spam system, maybe this time snapchat will copy some of facebook stenghts.