CAL.COM GOES CLOSED SOURCE: WHY AI SECURITY IS FORCING OUR DECISION

Summary from the TLDR Dev newsletter

Cal.com is moving its main product from open source to closed source after five years. This difficult decision was made primarily due to escalating security threats from AI, which can now rapidly find and exploit vulnerabilities in open-source code. While the core product is closing, a separate, open-source version called Cal.diy will be released under an MIT license for hobbyists and developers.