There are three TLDs I block on my computer completely, and all of them are file extensions - .zip, .md, and .mov.
(Yes, the domain "readme.md" exists. Fortunately, whoever owns it is not using their power for evil and does not have any webserver there... but I'm not risking it.)
I am SO tired of the Claude docs site getting a rich preview every time anyone mentions “claude.md”. At least it’s registered by Anthropic, but what a terrible decision to allow these TLDs.
To be fair, .md is the ccTLD for Moldova, first set up in 1994[0], ten years before Markdown was even a thing. The ccTLDs use the ISO 3166-1 alpha-2 country codes, defined in 1974 (according to Wikipedia)[1].
Moldova has every right to the ccTLD. It's just that I find that Markdown files can sometimes get auto-linked to the corresponding (and frequently non-existent) domain, which could catch me out if I'm unaware... and I don't even know of any sites using that ccTLD, hence why I block it.
(Yes, the domain "readme.md" exists. Fortunately, whoever owns it is not using their power for evil and does not have any webserver there... but I'm not risking it.)