I would be willing to bet that, around the same time those tools become widely distributed (kind of like what stable diffusion did for AI artwork), adversarial tools that emulate or obfuscate writing styles will exist as well.

I guess to analyse your writing style from thousands of billions of messages on Internet in order to simply link two of your accounts together is... overcomplicated?

I mean of course it could work, but except if there is a very special interest for an account, we may need to wait some decades before a list of "linked accounts" containing it in particular could emerge, right?