- The old CentOS had a brand value, which Rocky Linux has to earn back all over again.
- The old Red Hat was nice to CentOS or at least wasn't particularly hostile. That does not mean IBM will be nice too.
- It may be too short a notice for current CentOS users to wait for Rocky Linux to come through. They may already move away to other alternatives like Debian or Ubuntu or Amazon Linux or whatever fits their use case.
- If because of some miracle, Rocky Linux turns out to be just as successful as CentOS, there is a chance that either Red Hat or a competitor will end up taking control of it too. Corporate sponsorship is too lucrative to decline. So, it will end up with the same fate as CentOS.