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@lnxw48a1 captchas are a failed technology. Usually I can't solve them. So if you have a captcha as part of login or signup you're just building in inaccessibility.
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@strypey it's a difficult problem to which I don't think there's jet a good solution. Upvoting or downvoting of comments is one possibility. Another might be to keep the number of users on servers small so that more cost is shifted to the spammer and their activity becomes less economical.
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@strypey The Freedombox type of arrangement. You have a box which is your server or maybe a router/server combo and at most you maybe have a few other users on it, and then you federate with the rest. This is actually what I'm doing now, and so I don't need captchas and can control signups quite easily.