It's not that love is hard to find, but that there is no archaeopteryx. What does this meme mean?

This is an online buzzword, which means that love is not hard to find, but it is difficult to find one's archaeopteryx, the legendary "original match", which can also be understood as one's Mr. Right/Goddess. This sentence implies that many people in modern society are confused and uncertain in love, hoping to find a person who really suits them.