Is it still possible to distribute an app without Code Sign and Notarization?
I cannot afford to pay $100 per year to distribute a shareware that sell for $20!
If you search a bit, you can find options that bring that price down to ~US$50 or US$60 per year.
https://aboutssl.org/cheap-code-signing-certificate-providers/ (one such search)
I do see everyone's concerns about the costs here, but there is a potential security implication for unsigned software. And not just on the Mac, but on Windows also.
That's why I opted to go the code signing route for my scripting utilities, even though they are FREE. It's one less concern that users and enterprises have, and one less chance to be mistakenly quarantined by antimalware apps.
But I make the money back in technology consulting, and this won't be true for everyone, so I do understand the concerns...