You can deliver unsigned Mac apps too, just not on the MAS.

Running an unsigned app requires a separate option that's reasonably well-hidden, however [0], so it's difficult to avoid the signing requirement if you're going to distribute your app to a wide audience.

[0] https://www.macworld.com/article/3140183/how-to-install-an-a...

The are blocked by default from the latest two of three versions of macOS. You'll have to explain your users to right-click on the app icon and click Open to launch your app.