Whomever made that tweet for HBO wasn’t a lawyer.
Had they used the actual Game of Thrones logo or an image of a dragon or character, then they would have something.
As it is, it’s at worse a parody.
And it is probably less egregious than these NASA promo posters, who did let the actual Starfleet logo slip in.
In short, we don’t want copyright law to be that broad. Period.
