Online ads on Google’s AdWords network are a great way to reach a larger audience interested in your services, but breaking the rules can have harsh consequences. Google removed over 524 million “bad ads” from its ad network last year, and 214,000 of those advertisers are entirely banned from the service due to their bad behavior according to a recent announcement from Google.

“While this represents a tiny fraction of the total ads on our platform — the vast majority of advertisers follow our policies and act responsibly — we continue to remain vigilant to protect users against bad advertising practices,” Vikaram Gupta, director of ads engineering at Google, wrote Tuesday in the post.

The latest data shows several improvements from past years, such as a distinct drop in banned advertises for promoting counterfeit goods, but Google says it is a “constantly evolving fight” and the war against bad ads is far from over.

The announcement highlighted several of the “bad ads” trends that dominated 2014, including more than 43 million ads trying to trick users into clicking, over 4.3 million ads containing copyright infringement issues, and over 9.6 million ads containing healthcare-related violations.

The following infographic breaks down Google’s efforts to weed out bad advertising last year:

Google_BadAds_Infographic_Feb02-Final

For years, Google has had a strong hold on the search industry, maintaining over a 75% market share for the desktop search market. If recent months are any indication however, that grip appears to be loosening.

According to the latest data from StatCounter, Google’s desktop search market share dipped below 75% for the first time since July 2008, continuing a downward trend that started in November.

US Search Share Jan

In November, Mozilla replaced Google with Yahoo as the default search engine on its Firefox web browser. Initially Google didn’t seem to be concerned, but a three month drop in search share seems to be finally getting their attention.

In mid-January Firefox users who visited the Google homepage were greeted with a banner encouraging them to set the search engine as their default. At the same time, Google also began tweeting instructions for how to replace the search engine.

US Search Share Jan Firefox

Since the five-year agreement was made between Yahoo and Mozilla, Yahoo has been consistently gaining ground, already replacing Bing as the second most popular desktop search engine. In total, Yahoo has nearly tripled its share of the desktop search market on Firefox, climbing to over 28% from less than 10% in November.

In the long run, it is still unclear whether Yahoo is going to be able to continue its ascent. While the changes are substantial, Firefox is also the least popular major desktop browser available. The change is search share is also limited to desktop, suggesting users aren’t so much choosing a new search engine but accepting what they are being given.

Despite these challenges, Aodhan Cullen, CEO of StatCounter, says Yahoo is already beating the odds:

“Some analysts expected Yahoo to fall in January as a result of Firefox users switching back to Google. In fact Yahoo has increased US search share by half a percentage point. It will be fascinating to see if these gains continue.”

It will be interesting to see if the trend continues and how Google might try to persuade more users to actively choose their search engine over the default.