The Developer ID certificate is the digital signature macOS uses to verify legitimate software. The certificate that Logitech allowed to lapse was being used to secure inter-process communications, which resulted in the software not being able to start successfully, in some cases leading to an endless boot loop.

This is 100% on Apple users for letting a company decide what their computer can and can’t run. And then brag about its security like it has some super special zero trust architecture and is not just a walled garden with a single point of failure dependent on opaque decision making criteria for what code should be “allowed” to run on the system.

Key and signature based security model does not prove if it’s safe, it proves if it’s approved. They’re not the same.

Macs don’t get malware. Unless it’s malware Apple approves, those are called apps.