"Commercial use" in cases like this is actually just a shorthand to indicate that the product is dual-licensed under both an open source and a traditional paid-for commercial license.

‎Find free photos, cliparts, vector graphics and thousands of free video clips. Over one million royalty free photos, illustrations and vector graphics - and thousands of free video clips. No attributions required. You can use our pictures for just about anything — your website, blog or online store, school projects, Instagram ads, facebook posts, desktop backgrounds, client work and more. If you like an image you can do the Google Advanced search, just to check if that image is free and can be reused.

No attribution required. Huge library of stunning, high quality, royalty free stock images. Any "true" open source license will not discriminate against commercial use. All images and footage on Pixabay are released under Creative Commons CC0: Free for commercial use, no attribution required. No purchase required. The very popular, free image site Pixabay recently launched a mobile app for both Android & iOS.
Pixabay is the most valuable free alternative to commercial stock photo sites.

Pixabay - Free Images Over 300,000 high quality photos, illustrations, and vector graphics on Pixabay.com.All images are free - even for commercial use! Download free, high quality stock images, for every day or commercial use. Browse over 300,000 free stock photos and find the perfect royalty-free image quickly.

Free for commercial use No attribution required Free stock photos you can use everywhere. Pixabay is the most valuable free alternative to commercial stock photo sites.

Free stock photos for commercial and editorial use. (See clause 6 of the Open Source Definition.)

No, you can’t because most of the images on Pinterest has strict copyright and cannot be used as commercial purpose. The Pixabay mobi… Today, I’m sharing one free mobile app that is going to be very handy for every blogger and social media influencer to get free images – even for commercial use – from their mobile device. All images and footage on Pixabay are released under Creative Commons CC0: Free for commercial use, no attribution required.
All our photos are free for commercial use with no attribution required; you can read more about this on our license page.