This is not an easy post to write.When we started Cal.com, we believed deeply in open source. It’s a core principle we built this company around, and something we’ve been incredibly proud of.Today, we are making the very difficult decision to move to closed source, and there’s one simple reason: security.AI is changing everything. It’s transforming how we write content, build software, and operate day to day. But what’s talked about far less is how dramatically AI is changing the world of securi...