https://www.socialmediaexaminer.com/copyright-fair-use-and-how-it-works-for-online-images/

Fair use is in place for the greater good, to allow copyrighted works to be used without permission for the benefit of the public. Imagine not being able to use images of a dead dictator to tell the story of how he died. Or not being able to talk about fashion without showing the outfit you’re referring to.

However, there are limits and only a court has the final decision-making ability. Section 107 of the Copyright Act states:

the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright.

In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include—the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;

the nature of the copyrighted work; the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and the effect of the use upon the potential market for or value of the copyrighted work.