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Who knows. They are not even good names, the usernames are usually part of the email. It's usually super easy to figure out. Captcha's were dependent on web sockets, so once the Devs got rid of those the captchas broke anyway.

Tinfoil hat mode With enough accounts you could influence the algorithm by voting up content you want vs content you don't want. Or basically DDoS servers. As every like on a post for a community is sent to every other instance that federates with that community.

Or it could be people creating accounts to inflate the numbers of the fediverse to write this content and make silly headlines like these.