This looks very interesting, will look into it!

What are the practical differences between swarms and k3s?

This sounds good, but what is a cluster exactly? Is it just a collection of machines?

I’m not sure how much you can trust them, but you might want to have a look at Authelia

Yeah they are

Google doesn’t do that either, so we wouldn’t have to either. I could name a few places that use photos from 10+ years ago, which look drastically different from the present