But OpenSea is cool and SecondSea is not. Anyone can own things on SecondSea so it's basically worthless.
"I own a Mona Lisa NFT."
"Oh really?? You mean THE Mona Lisa NFT?? How did you manage? I thought that was owned by Louvre!"
"No, i mean, I bought this one on SecondSea"
"Ah ok. I bought it on ThirdSea just to test. It's free after all. But nice, good for you."