It's okay maybe if you're doing image labeling, if they are workers. Not if they are taking surveys on opinions etc.
Imperfect randomness problem plagues current research but that's like patient has fever vs patient has no lungs.
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(That is, if they are actually trying to do nationally representative and falling short; not usirgn turkers etc).
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Ease of research like this means this will unlikely go away; and esp. non-social science outlets will accept them.
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