Yup. They are apparently generated by a bot across multiple accounts, but it doesn't post publicly so it can only be reported by the people who receive the message.
maybe there should be some feature just to increase account creation friction, something like having to click on a link in an email each day for 2 days ...
Admins can optionally require people to write a little message saying why they want an account, then the admins have to approve each account manually.
(Another option is having invitation-only signups, but that makes it difficult for people new to the platform.)
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