I don’t even understand the benefit of it. It’s not like memeing is a job where you have to protect your intellectual property. Why even do it? Do they think so highly of themselves that they need to “protect” memes that they create? They’re randos on the Internet adding captions to images, not V/A professionals…
It also goes against the longstanding spirit of Internet memes, that they are things to by definition be shared, not intellectual property to be bound.