@firstname.lastname@example.org Right. TOFU's also long been used in PGP/GPG, and is arguably more widespread than the Web of Trust.
A widely practices mis-assertion of a key is likely to result in a public disavowal ... eventually.
For someone with a particularly high threat function / risk calculus, that's not attractive. And for most casuals, it's yet another idea that can lead to bad practices / poor decisions which might later be regretted.
@email@example.com TOFU's prevalence shows though that even with strong crypto and good tools, validation mechanisms are largely informal.
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