I'd not be surprised if their growth this year is even bigger than last year. 2017 is the year of the Youtube Adpocalypse and more and more creators are looking

I'd not be surprised if their growth this year is even bigger than last year. 2017 is the year of the Youtube Adpocalypse and more and more creators are looking for alternate, more stable, revenue streams. There is still a lot of potential of revenue coming in from existing big content creators switching to the platform. When Philip DeFrance started his Patreon a few months ago he became the #2 most sponsored creator in Patreon in a few days, and his channel is "only" ranked ~350th by number of subscribers.