Google sometimes recently refreshed their AdSense policy, and also removed the "ad limit per page" section and replaced it with "valuable inventory."
The ad limit restriction had restricted publishers on placing amount ads per page. Per the old policy:
"Ad limit per page
Currently, on each page AdSense publishers may place:
– Up to three AdSense for content units
– Up to three link units
– Up to two search boxes
Publishers may not place more than one "large" ad unit per page. We define a "large" ad unit as any unit similar in size to our 300×600 format. For example, this would include our 300×1050 and 970×250 formats, our 750×200 and 580×400 regional formats, and any other custom sized ad with comparable dimensions."
Now, the new 'valuable inventory' cautions publishers that "advertising and other paid promotional material added to your pages should not exceed your content." Doing so, Google may limit or disable ad serving until changes are made on the pages "with little to no value and/or excessive advertising."
Furthermore, the content you provide should add value and be the focal point for users visiting your page.
Some examples of unacceptable pages (include but are not limited to):
- "Mirroring, framing, scraping or rewriting of content from other sources without adding value;
- Pages with more advertising than publisher-provided content;
- Automatically generated content without manual review or curation;
- Hosted ad pages or pages without content;
- Pages that don't follow our Webmaster Quality Guidelines," from AdSense Policy.
A Google representative confirmed the ad limit has been removed. The reasons cited behind the removal include:
- Probably the primary reason behind this change is to create a better balance between quality content and advertising. Previously publishers among other tricks were breaking their contents into multiple pages, hopefully now less slideshow-based content will be created.
- Google introduced many new mobile-friendly and responsive ad units. However, publishers are hesitant to test the new ads, because they would need to remove one of their existing ad units, which could potentially lead to a loss in revenue.
- Since publishers are hesitant to display new ads, companies that are paying to advertise via mobile-friendly ad units are not receiving a maximum return on investment, via.
Google sees this change will allow them to further monetize their content while keeping advertisers happy at the same time.