Yes, they can! If you log into your commercial account on Obsidian.md, you get the option to upgrade to Catalyst as well. In the app, log into your account and you can see your Catalyst tier. As long as you have activated your commercial license in the app (which does not require logging in), itās good for commercial use.
I hope that helps! Insider builds are not as stable as normal versions though, so please make sure to back up your work notes. Thanks for the kind support!