Gwern has hands down one of the worst blogs, readability wise, ever created on the internets. His writing style can be hit or miss too.

I think that's a little extreme to say it's one of the worst. It's definitely a different style to a lot of blogs, but I like how much information is spread across the site. It's satisfying to explore on a desktop.

There are definitely less readable blogs, even restricting to ones that aren't intentionally hard to read. For example: https://www.lilywise.com/amusement (Disclosure: written by my kid, who was just shy of 7yo then)

Personally, I like Gwern's style and aesthetic a lot, and don't have trouble reading his stuff.