Except they’re aren’t violating the GPL at all. Their source code is still available to subscribers (and it isn’t behind a paywall because you can get a free license) and available to the public via CentOS Stream. Their code also goes into upstream projects as well.
The GPL exists so that companies can’t just take the code and contribute nothing back. But that isn’t what Redhat is doing here so I find your accusations that Redhat is exploiting users to be very hyperbolic.