https://petapixel.com/2018/07/02/court-rules-copying-photos-found-on-internet-is-fair-use/Brammer v Violent Hues: The court ruled that finding a photo on the Internet and then using it without permission on a commercial website can be considered fair use.
This will be overturned when it is appealed, but this business of "transformative" fair use is getting out of control. By these extremely liberal interpretations, which are very popular among the non-content creating public and business sectors, almost nothing can be considered infringement.
The most prominent examples of the "transformative" claim include Buzzfeed's creation of viral top ten photo lists using stolen content and the Richard Prince "appropriation" cases:
Our collective input and voices will likely be needed to reverse this trend, particularly in the passage of the CASE act (Copyright Small Claims). The Federal district courts are not experts on copyright law, so decisions can vary wildly. Many of them are appealed to higher courts, where the low-level decisions are frequently overturned. This is of course very expensive to the photographer bringing the suit.
I can't stress enough how important it is to make your voice heard:
If this trend does not change, it would be adviseable to take all of your work offline and only post tiny thumbnails. I may be doing that myself soon.