> I sometimes wonder about file storage using a textual output format that can't be distinguished from normal user interactions.

I guess it depends on what noise-to-signal density you’re after.

With a a long enough ChatGPT generated output, no one would question a few out of place characters or even an emoji. With 3000+ different emojis to choose from that encodes an entire byte of data.

Another idea is using “they’re”, “their”, “there” as bits.