There doesn't appear to be a tag category change request option for tags with over 100 posts, so I'll go ahead and make a forum post instead.
If it's fine with the mods. I'll just go ahead and add to this thread whenever I (or anyone else) see a 100+ tag that might need a change.

general:a_cat_is_fine_too -> copyright:a_cat_is_fine_too

Reason: Most meme tags use the copyright category nowadays. Seems like a good idea to update the older tag to what appears to be the new standard.