Google updated Adwords display URL policy to allow only one top-level domain as display URL within any single ad group. For example, the following URLs fall under the same top-level domain “example.com”, and would comply with the new policy:
However, the following URLs would not comply:
The above two URLs are considered as two different top-level domains as they are essentially:
If you have always been keeping one website (essentially one display URL) per Adwords account or per campaign, you will not be affected by this change.
The new display URL policy will be implemented on 24 February. This means ads that do not comply with this policy change will be disapproved by this date.