Currently there are several settings that are enabled by default for maps. Change the "Save As" setting of "Allow others to save a copy of this item." and "Use in ArcGIS Field Maps Mobile" from enabled by default to disabled.
Reasoning....
Not every org wants folks to be able to save copies of the maps they make by default
and...
Not every org wants Field Maps Mobile enabled for a wide variety of reasons to include....METRICS. It's hard to ID a field maps enabled map that is being used for field maps, when everything by default is a field maps map.