Cloudflare doesn't do April fools jokes. In fact, 1.1.1.1 was released on April 1st back in 2018 and now it's one of the most used DNS service in the world.
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It's a legit April Fools'.
On the initial commit:
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This for "a spiritual successor to WordPress".
8 years later and now I'm getting the 4 1's joke.