Hackathons are not working more. They’re supposed to be a liberal period to work on whatever seems interesting to the workers. In Meta’s early days, they were a big part of their culture and Zuck in particular fed on them.

I don’t expect everyone to know anything about Silicon Valley hackathons, but no, they’re not just “more work.” However when people are already crushed by what’s going on at work, they don’t have a lot of creative energy just looking for an outlet.