"Beginning in macOS 10.14.5, software signed with a new Developer ID certificate and all new or updated kernel extensions must be notarized to run. Beginning in macOS 10.15, all software built after June 1, 2019, and distributed with Developer ID must be notarized." - https://developer.apple.com/documentation/security/notarizin...

You can't release a driver for Mac without Apple's permission. Apple won't allow Nvidia to release drivers for newer cards. Nvidia has stated this on multiple occasions.