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You can set messages to expire in keybase:

That looks completely orthogonal to Perfect Forward Secrecy.

It's based on an ephemeral key schedule underneath. Here's the design doc: https://keybase.io/docs/chat/ephemeral

I was just looking into keybase, and.... deleted. Thanks for the heads up.

I was under the impression it's the same for Signal. Quick duckduckgo led me here: https://signal.org/blog/asynchronous-security/ The more you know!

There's also a targeted attack that allows arbitrary keys to be linked to your keyring to DoS you.