> Especially the fact that TLS certificates that customers entrusted bunny now need to be revoked by the customers themselves. This detail was at the very last of the email I got and it was the only part I did not like, because it means customer secrets were indeed compromised.

It does not mean that at all, it’s sane risk management. There was an opportunity for someone to steal customer secrets so the safe thing to do is assume everything was compromised and revoke/reissue certificates even if nothing was stolen.