Keybase: Some people state that they will never use Keybase since everybody is forced to upload their private, secret GPG keys. This is a myth …
Since 2015, Keybase solely relies on per-device NaCl keys:
NaCl was created by cryptologist Bernstein, who is also known for Curve25519:
You don't need to upload any secret GPG keys. You can even use Keybase without uploading any GPG key.