If a single writer publishes lots of long pieces every day, I'm not sure it's necessarily ChatGPT. It could also be a bunch of writers publishing under the same account. Or someone hiring ghost writers. Or someone who has an archive of pieces they have written over several years and are just now reposting them all to Medium.
Also, there are some writers who really can crank out a lot of content each day—maybe not hundreds of articles per day, but definitely half a dozen or so.
Either way, I'm curious how this will all pan out in the long term. My bet is that there will always be a place for human writing and that we won't all be replaced by AI :)