Doxxers frequently go after people who probably don't yet know they've been targetted and services like Keybase make it easier.
If someone is purposely trying to be anonymous, Keybase can support that because although it ties your IDs together, it does not necessarily have to tie into a real world ID. Example: https://keybase.io/th3j35t3r
It is best to not use Keybase or similar services at all. Or, at least, do not use that part of the service.
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