This was EXACTLY the same case against Twitter though: they are obviously politically bent, but they market themselves as the public square. They pitch over and over that they absolutely don't moderate on the basis of politics. If they simply admitted they're politically-bent, that'd be fine, but they don't. That's what Elon is doing now, that's what Twitter did then.
To be clear I'm not a fan of what Elon is doing either (because he's doing the exact same thing Twitter did: posture as unbiased while obviously being biased), but I also recognize the only thing that's changed here is the direction of the bend.