Is there a potential downside? Yes. Just because a search engine sees something as Creative Commons doesn’t necessarily mean that it is. Here at MakeUseOf, for example, we’ve had at least one photographer threaten to sue us over an image he didn’t realize he himself licensed as Creative Content. He backed down when we pointed this out, and it’s one example resulting from thousands of blog posts spread over a decade, but know that this isn’t without risk.
As an artist I resent some people's assumption that original art from my abilities and imagination, which I have sacrificed a lot to develop, should somehow default to public property. If we require artists to participate in a money economy their art belongs to them. Copying images and not following the copyright owners permissions to the letter is stealing, outright. And deep pockets like Disney has taught individuals that the hard way.
Back in the ‘90s, Clip Art took over Word and PowerPoint files thanks to the thousands of office workers and students who used the images as a way to “improve” their documents. These days there are a large number of free images available on the web, and Microsoft is recognizing this by killing off its Clip Art portal in recent versions Word, PowerPoint, and Outlook. “The Office.com Clip Art and image library has closed shop,” explains Microsoft’s Doug Thomas. “Usage of Office’s image library has been declining year-to-year as customers rely more on search engines.”