It seems Apple has disabled the ability for users to bypass application signing entirely, which would be just the next step in the company’s long-standing effort to turn macOS into iOS, with the same, or at least similar, lockdowns and restrictive policies. This would force everyone developing software for macOS to spend €99 per year in order to get their software signed, which may not be a realistic option for a lot of open source software.

Source: Bug or intentional? macOS 15.1 completely removes ability to launch unsigned applications - OSnews

This is troubling