Apps like Adaway or Emoji Switcher that need to make changes to system partition on the device simple fail on Nougat even after root.
But thanks to user Shivam is our resident designer and web developer who also enjoys writing.
"Ad Away is a utility for root users used to help manage hostfile entries.
Ad Away doesn't directly block ads; it limits unwanted ads by blocking servers that distribute those ads to websites." It is available from F-Droid as well.
For the record, Ad Away doesn't cause any app to crash, nor does it prevent any ad from being displayed.