I'm glad to find I am not the only one arguing against registration requirements online. Here we have a a paper on the hidden cost of requiring accounts (25 page PDF) in wiki conmtributions. "Requiring accounts leads to a small increase in account creation, but reduces both high- and low-quality contributions from registered and unregistered participants." And "although the change deters a large portion of low-quality participation, the vast majority of deterred contributions are of higher quality." Via Community Data Science Collective.
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