Having to pay to tweet would be the death of Twitter. It wouldn't just shrink, it would be thoroughly decimated. It would initiate a vicious spiral in which Twitter becomes less attractive to read because fewer people are using it to tweet, which causes fewer people to feel the need to tweet, etc. As the audience shrinks big names leave the platform (because getting attention was the name of the game for them), causing even more of the rank-and-file to leave. Advertiser revenue would plummet. Any Twitter that does possibly survive would be a zombie, so minimally profitable there'd be no conceivable way of keeping up with those interest payments.

I get the point information warfare, but you may as well just wish for Twitter and other social media platforms to outright die.