No quite, the generic drug makers can produce the product from scratch without the help of original manufacturer. Also RHEL is contentiously being developed, once a drug has been designed, there's no requirement to keep it updated (ruffly speaking). Rocky Linux is dependent on RedHat staying in business.

The problem will only manifest itself if RedHats business is sufficiently underminded. Losing a few customers isn't an issue, and many of the users of Rocky Linux probably wasn't going to buy a RHEL licens anyway.