RedHat killed off CentOS in its previous form. RedHat also now has a written policy of terminating customers who exercise their GPL rights of republishing RHEL source code. That seems like subverting the GPL far worse than a CLA. If that's the best example here, then that already speaks volumes.

Perhaps you can list some other examples of successful businesses who offer their core product under AGPL without a CLA?

As far as I've ever seen, when AGPL software is built by a business, a CLA is used.

To quote Heather Meeker: "In privately funded business, AGPL is almost always used as part of a dual licensing strategy [...] Vendors almost always use a contribution license (CLA) for contributions from the community." https://heathermeeker.com/2023/10/13/agpl-in-the-light-of-da...