Ubuntu PRO is a subscription with 10 year support for Ubuntu main and Universe repos, so more than 10 thousand packages.
It's also much cheaper, and comes with more features like kernel live patching.
Ubuntu is not a “hobby distro”. I do not even like Canonical but let’s be real. First, Ubuntu is used as the basis for just a giant fraction of enterprise software in the cloud and in embedded. Second, companies pay Canonical big money for even their managed Kafka offerings and such. Canonical is a legitimate business alternative. They are not peddling 10 year support for the hobbyists.
RHEL competitor in the market is Windows, not half supported hobby distros.