@simontatham And then there’s the fact some of us have moved away from Qwerty, meaning our wrong-finger or missed-key typos and even hands-out-of-sync typos are at first glance utterly strange. So even focussing on English users, the #KeyboardLayout would be a confounding factor.
@pjacock yes, I've had that thought too. I don't know Dvorak (for example) well enough to recognise its characteristic typos, but maybe someone who does would be able to detect another Dvorak user from a page of uncorrected text they'd written?
@simontatham they probably could. Of course nowadays there are at least hundreds of niche layouts (in part building on increasingly sophisticated computer analysis of growing corpuses of text - see eg https://layouts.wiki/guides/start/intro/ which has loads of examples).
I guess this means learning an alternative keyboard layout is actually a privacy issue - typo-fingerprints being another way to identify you just from your writing?
@pjacock less so if you can proofread competently. But that seems rare enough that maybe it's also an identifying mark :-)