At the very least there are a) more active keys b) those keys are available on keyservers and c) it's being used by the major packages in the ecosystem correctly. i.e Spring, Jackson, Quarkus, Logback, Apache-sphere, Google-sphere, etc.

So while it might not be providing meaningful security for lower-tier packages it's definitely doing it's job for top tier packages like these that are relied on by hundreds of thousands of projects.