This seems like a pet project. Reason I say that is if it was built for work, it would likely be from figma. Instead this project is from Evan himself.
I'm not so sure about that as you. Not all companies are like Google and "steal" the credit of work done by employees, even if done on work time but unrelated to the core business. Plenty of companies let employees work on open source and still remain the owners of the software produced.
