My statement was very clear “developers are not forced to be part of the developer program.” Meaning that unlike ios, there are ways to distribute your app without signing it. “Notarization required by default” != “there is no method to distribute unsigned apps”.

https://www.google.com/amp/s/eclecticlight.co/2019/06/07/not...

Catalina still runs apps which haven’t been notarized or even signed, including those built after 1 June 2019. But you may find them more complex to run, and they don’t of course benefit from any of new security protection unless they’re signed and hardened.