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 Wasn't captcha designed precisely for this use case?
Nostr is superior, it's much more agile and versatile, thanks to the LN integration. 
X looks more and more like grand'pa technology. 
 Yes, I don't get it.  The current sign up uses an even more complex proof of work/proof of human tool than a capatcha, you have to solve several differnt puzzles in a row. How that doesn't defeat the bots begs the question, why have it at all? 
 Possible that bot operators hire slaves in 3rd world countries to open accounts... 🤷‍♂️ 
 true, but does that account for most bots?  Paying people to do those things has a cost also, though less than a dollar I imagine.  Still, I presumed the overwhelming majority of bots are auto generated by bots.  If not, then we should really find out where these poor slaves are, musk should focus on that human rights issue, as that must be one hell of an operation if there are enough of them to disrupt a billion people on twitter .