> URLs to a registry keep published versions if the registry keeps published versions.
Yes. Have you've ever heard of running your own registry? It' quite easy to do and most companies do it prcisely because they want to a) keep published versions and b) prevent things like colors/fake.js
Literally no one who promotes Deno has yet shown how to do the same with Deno beyond "yeah, you check in all your node_modules dependencies into Git".