Public keys stored on different server

[Martin]

Hello

Perhaps my question is strange an silly ;-)

More and more I see messages which are signed - but the author didn't
store his public key on a keyserver (eg. hkps://keys.openpgp.org) -
sometimes a footnote in the massages gives a link where the key could
be downloaded. Sometimes this link has a bad or strange https 
certificate...

What are the reasons for such a procedure and what is the advantage?

-- 
Best regards,
Martin
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