Not saying this out of any support for Elon or Twitter, just because I respect free speech.
It would be nice if the US pushed back on the EU on this type of thing. Going after platforms for the speech of their users, especially with a government mandated monetary incentive behind it, is an open door for censorship and unfairness. A US company, born under the auspices of a nation where free speech is literally rule number one, should be defended by the US government when other nations create rules attempting to stifle that free speech (especially when those rules also come with huge fines which siphon money, however much, from the US economy).
Governments should be developing ways to stop bots and botnets not stifling human public expression, no matter how disagreeable to the political sensibilities of those governments that expression may be.
IMO it seems RECs are a better solution than carbon taxes at least in situations like this. With RECs you're buying renewable energy to offset non-renewables, with a carbon tax the company is just giving the government money for use of non-renewables. Only funds spent on RECs in this case actually go to supporting the renewable energy sector. I'm no expert in this stuff so I could be off, just how I understand it.