Cutback provides search and usage of photos and videos from Unsplash, Pixabay, Pexels, and Giphy, and displays the source for each photo and video.
Therefore, all licenses follow the licenses of the respective sites.
The following is a summary of the licenses for each site. Please check the actual site's license link for the exact license terms.
Unsplash (photos, videos)
Can be used for free, even for commercial purposes.
https://unsplash.com/license
Pixabay (photos, videos)
Can be used for free, even for commercial purposes.
https://pixabay.com/service/license-summary/
Pexels (photos, videos)
Can be used for free, even for commercial purposes.
https://pixabay.com/service/license-summary/
Giphy (GIFs, stickers)
Can be used for free only for personal and non-commercial purposes, and cannot be used for commercial purposes.
https://support.giphy.com/hc/en-us/articles/360020027752-GIPHY-User-Terms-of-Service