WTF custom game thumbnails

Today searching custom games i saw that there was lobby with a -Yoink!- thumbnail. About an hour later when i searched custom games again the custom game and thumb nail was still up. It was a brand new account who made it. I reported the gamertag through Microsoft but idk if that does anything.
How are people able to upload stuff like this into halo 5?

It’s a known thing. You can read a little more on the subject here: but for now we’re closing down the subject.