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Well, you can put catchas in case you doubt there is a bot activity.

They also have so many phone number and email they can use that to do additional checks.

They you can use the network effect: bots usually have something in commons: topics, likes, ip, followers...

If you have millions at your disposal, something can be done.

They are not, so I'm more encline to assume there is benefit for them to avoid doing so.



Would it take millions?


At twitter scale, doing anything is costly.




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