Use a pen name and you're only anonymous until somebody outs you on chain.

Not even that needs to happen. Many of us have more than exceed enough for writing samples to be taken and compiled in a database that can be compared and contrasted against other writing samples. Your own writing style, word usage, and other factors is a digital fingerprint.

People like to think they can’t be boiled down so easily into numbers like that. Big data scares the daylights out of me.