Did 37Signals Just Accidentally Make Writebook Open Source?

When 37Signals launched Writebook in 2024, it was under their ONCE License Agreement. Notably, that license does not include the rights to publish, distribute, sublicense, and/or sell copies of the Software, source code or products derived from it. If you visit once.com/writebook today, you ll see these in the FAQs: However, the software license “does not include the rights to publish, distribute,…