I have researched the issue of nsurlsessiond eating up bandwidth and have applied all of the suggested solutions and it is still using up mysterious bandwidth.
I never use iCloud on any of my devices. It is turned off in Photos and Photos is turned off in iCloud. There is only 10mb of data in my iCloud account.
I have turned off "Allow Spotlight Suggestions in Look up"
I have all auto updates in Software Update turned off.
I have installed UBlock Origin to block ads and tracking in my browser.
So far today I have watched nsurlsessiond eat 1GB of my very limited data in a couple of hours.
Please make it stop 🙁