In other words, plagiarism is an act of fraud. It involves both stealing someone else’s work and lying about it afterward.
Images posted in artistic tags require attribution or a source if the contributor is not the photographer or artist.
Is it only plagiarism if it is in a creative tag? No.
The sheer volume of images displayed on Steemit makes it impossible for @steemcleaners to respond to them all. There is still a large part of the community that does not see this as plagiarism unless they explicitly state the image as their own work.
Stock photography is commonly purchased and used by many and usually requires no attribution when used in a written post. Content creators should be aware of the attribution requirements and follow them when using images that are purchased, public domain, or have a creative commons license.
If the primary value in a post is the image, regardless of tag, attribution or a source should be given if the contributor is not the artist.