You can also use them for production. Scroll to the bottom of https://sso.redhat.com/auth/realms/redhat-external/protocol/... and follow the link to the terms & conditions:

> The Individual Developer Subscriptions allow you (as an individual, natural person) to use certain Red Hat Subscription Services in connection with Red Hat Software for Individual Development Use and for Individual Production Use subject to these Program Terms at no cost.

> “Individual Production Use” means any use other than for Individual Development Use including, but not limited to, using the Software (a) in a production environment, (b) with live data and/or applications and/or (c) for backup instances

Red Hat also have a no-cost Developer Subscription for Teams agreement for organizations.