the presence of the (or any) mdm app itself is fine, though murena should make that repo public instead of prebuilt only - the issue is its setting as device-admin when the user didn’t explicitly ask for it - I guess a build error on S7 devices. I do think there is no enrollment yet to an org.
I’d either wait until a system image is shipped that removes device-admin, a mdm package version that has android:testOnly added so the user can disable it - or downgrade or use anything else.
As for missing explanations - the official one (if you’re enrolled to an org the org can wipe - that is what noone will like, but I think even when assigned, without enrollment - no enactment). The /e/ mdm package itself is headwind mdm derived (had a hunch, but really it’s the only foss android mdm around).