Package Registry Service usage for public distribution

Are there any Swift packages currently being publicly distributed using a package registry service? (i.e. the distribution mechanism described in SE-0292).

I'm considering using this means of distribution for a large open-source project, but I'm not aware of any community Swift packages currently distributed via a package registry service.

I'm interested in both developers' experience with this means of distribution, and for developers who considered a package registry service but rejected it, what factors influenced your decision.