okay
what about an image of an alien as its logo to sell say coffee and burger or android phone

With the caveat that I’m not a lawyer, I think Dell could sue for confusion. I have a blog post here about a company selling train accessories in blue and orange boxes in the 1950s. Lionel sued. The colors are public domain but the boxes looked enough like Lionel’s boxes that the court ruled in Lionel’s favor.

But even without that, I don’t think anyone wants to risk Dell suing. Dell could sue and lose in court and still win, by dragging it out until the other party ran out of money.