It is because of the movie, there will also be more movies since sequels are confirmed. Both kinda ended and lost popularity in early 2017 since DR was at peak from 2012 to 2016 and FnaF from 2014 to 2016, so kinda at the same time. FnaF continued with pointless sequels later and before the movie, but it lost it’s popularity nonetheless. Now in early 2020s they had kind of a resurgence but of course won’t be able to reach the same popularity as before.

Yeah I heard about it but idk what it’s about since it’s not connected to Danganronpa.