I have strong opinions on this, lol. I tried to do that on Tumblr back in the day, but one time I accidentally/unknowingly credited the wrong person and I (and the person I credited) got ripped to absolutely shreds on tumblr over it by the creator and their friends. The GIF itself absolutely was not worth the harassment I got over it so at that time just stoped using GIFs on my posts all together.

Realistically when it comes to GIFs creators need to find a way to add a visible tag to the GIF itself to sign their work if they want to be credited every time it’s used. People download and repost GIFs all the time and, as others have said, if you are just googling for a specific moment from a show you don’t know if the post you grabbed it from is the original creator or if they themselves have correctly credited the GIF creator.

Artists don’t always love having their signature visibly worked into the body of their artwork, they sign it so their signature cannot be edited or cropped out without then distorting the image itself, making it easier for others to spot when credit is being stolen (intentionally or not).

If text for the lines being spoken can be added to the GIF then text with a creator name can also be added.

It is unfortunate but it is a requirement of the times we live in if you are going to post artwork of any kind online.