This makes photo copyright laws very broadly applicable to online content creators.US Copyright is a protection that applies to original works of authorship fixed in a tangible medium.From an aesthetic perspective, it’s a good idea, especially when the photo has something to do with the content.
That’s a completely different discussion, but don’t get offended if you ask your photographer friend to use her camera and she says no. Copyright is automatic upon creation of an original work of authorship.
With regard to photography, with few exceptions, every image obtains its copyright upon creation.
Of course, there are exceptions, but generally, the photographer owns the copyright.
This is actually very important to know should you ever hand your camera to someone else to take a photo.
And, of course, there is that “A picture is worth a thousand words” adage.