I would say: even if it’s just a free video, C.Y.A. (wear some pants). At a minimum.

In other words, distance yourself from anything that ties to any sort of intellectual property. Don’t use their names in a title/description, don’t use their pixels (especially not in a thumbnail), use original designs and even add your own ideas or changes/improvements etc. Define, generalize, and abstract.

Keep any hint of it off of the internet until it’s finished and released.