RedHat provides developer subscriptions to their products: https://developers.redhat.com/articles/getting-red-hat-devel...
_In the first half of 2021, we will be introducing low- or no-cost programs for a variety of use cases, including options for open source projects and communities, partner ecosystems and an expansion of the use cases of the Red Hat Enterprise Linux Developer subscription to better serve the needs of systems administrators and partner developers._
I believe we were one of the first 10 or so, but I don't remember exactly when it started.
Your only option is to migrate away from RHEL/CentOS, period. It's likely that Red Hat doesn't care much about us smaller orgs with only 100-200 servers/VMs though. Sad day.
Summarizing the FAQ:
- the bits are the same, the differences are the terms of use and the self-support level
- one subscription per user
- allowed to use on 1 physical system (up to 2 processor sockets, 16 VMs)