“Backrooms,” which was directed and co-written by YouTube creator Kane Parsons, cost only $10 million to produce.

“The Backrooms” is based on a viral short film series on YouTube that has amassed more than 220 million views.

YouTube filmmakers are ascendant, with 'Obsession' topping the second weekend of 'Mandalorian and Grogu' and becoming the first film in more than 40 years to increase in both its…