I think I need help understanding why this is in any way relevant or interesting. I'm actually serious and open to listening. Obviously it got on the front page.
Personally I find interesting the general idea that adding constraints to a system leads to creative outlets, forcing the participants to break entablished thinking patterns. The fun stuff here is not the content, but the alternative paths the writer has to take to convey the message.
For one, it's a gimmick that brings attention to Mastodon, which as a foss/decentralized alternative to Twitter, is interesting in its own.
Second, it's based on a centuries old literature/poetic challenge/game, of writing a text based on some constraint, and especially with avoiding a specific letter (a "lipogram").
Third, the challenge itself, which removes the ability to use the most common letter in English, is amusing enough to people. It makes you think harder about phrasing, and solve how you express something in alternative and creative ways. So it's a kind of fun game, like e.g. Scrabble.
Fourth, besides the fun/challenge factor, exploring alternative ways of writing a sentence is something that most people seldom think hard about, but that has applications in general writing too (in other words: what you gain by working around some constrain can make you a better writer in general, even when there are no artificial constrains imposed).