Rant incoming: I cannot tell you how many times I've tried to create a meme and the stock image has the logo all over it. Search for anything on google images (spaceship, boat, man smiling, etc) and you will get a ton of stock images with the stock image stamp of annoyance on it. /rant
It's fine if it's not an issue for you. But for me, if I'm creating something, I want the image itself to look as clean and HD as possible. For a lot of my memes, the joke is in the image editing itself.
But all that is just my personal preference for my shit. The rant wasn't meant as an attack