[js2]

I think you may be misreading the code. It concatenates the host files at the various URLs and then inserts their contents into /etc/hosts. I only looked at a couple of those files but the ones I did used either 0.0.0.0 or 127.0.0.1 as an address combined with a domain.

To be honest, this code is over-engineered. It could be a single script with a handful of functions. At the same time, it’s missing functionality such as deduplicating entries from the different lists.

[anned20]

Those are things that are still on a small personal todo list. I agree that it could be much simpler, but I like the elegance of it.