I know for a fact that rights issues were one of the reasons that Palisades Toys never made an Electric Mayhem bus. Sometimes those rights aren't really up for grabs even if one does their due diligence. The idea that they were lazy is a rather wild and insulting assumption.
I do think they could have blurred the line enough so that it would look closer to the original without having to secure the specific design rights. It all comes down to an issue of cost vs profit. This item is officially advertised as a school bus so I don't much see the problem.
I'm still glad they made it and this is really not the same thing as a collared salamander. I think we fans were spoiled by Palisades. If it's a choice between no bus and this bus, I pick this bus.