I think the distinction between mechanical and manual needs to be fleshed out a bit. To me "manual" implies a degree of care to other data (relative location of existing objects, links to other objects, existing versions of the same or related objects, other tags, consideration of the quality of the source, cross-referencing to other sources, that sort of thing). The amount of care depends on what you're doing, but obviously has a tendency to decline if you're dealing with more data. Telling people that they're not taking enough care is likely to annoy them. Asking them to self-describe themselves as a "bot" when they're taking a lot of care is also insulting.
So I'd choose some tag names that are a bit less loaded. But the principle that changesets should have a licence tag where that's clear/available is a sensible one. As is the message "keep your changesets at human-scale or set up a separate account". Richard
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