If anyone was wondering how to check for offending items, this is a script that I put together.
from arcgis.gis import GIS
gis = GIS("home")
search_results = gis.content.search(query="", max_items=-1)
# a dictionary containing the item object as key, and list of related services if that list is larger than 1
results = {
item: v
for item in search_results
if (v := item.related_items(rel_type="Service2Data", direction="reverse"))
}
# you can check the unique source types
represented_types = {k.type for k, v in results.items()}
print(represented_types)
# since the Esri response was non-exhaustive, the better methodology would be to exclude items we know would not be on an exhaustive list
remove_features = {k: v for k, v in results.items() if k.type not in ["Compact Tile Package", "Feature Collection", "Feature Service", "Vector Tile Package"]}
# these would be all of the items that you'd want to check
print(remove_features)
# and rinse, lather, repeat for item types that don't count
we were left with these types, does a service definition count as a source data item?
{'CSV',
'File Geodatabase',
'GeoJson',
'Microsoft Excel',
'Service Definition',
'Shapefile'}
