Last year I sent out an email asking if anyone was using EPEL Playground.  Nobody said they were.
I did an analysis of what was being built on epel8-playground.  The only builds being built were also being built at the same time on epel8.  Thus, it appeared that nobody that was building on it was using it for it's intended purpose.
An EPEL issue was opened, and a discussion was had in the EPEL Steering Committee.  All agreed that it was time to turn off EPEL Playground.[1]

It is time to shut it down.  I believe these are the steps.

* Update Documentation [2] (pull request)
* Remove from mock configs [3] (merged, currently in testing)
* Remove configs from epel-release (todo)
* Archive repo (todo)
* Officially announce that EPEL Playground has gone away (todo)
* Steps I didn't think of (possible)

Troy

[1] - https://pagure.io/epel/issue/136
[2] - https://pagure.io/epel/pull-request/143
[3] - https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-2d0f959e00