For CC BY, CC BY-SA, and CC BY-ND, Creative Commons itself explicitly mentions the word "commercial" in its summaries: https://creativecommons.org/licenses/ htt

For CC BY, CC BY-SA, and CC BY-ND, Creative Commons itself explicitly mentions the word "commercial" in its summaries: https://creativecommons.org/licenses/ https://creativecommons.org/licenses/ Of course, if your description is correct, Yahoo/Flickr may have an interest in downplaying that important detail.