Thanks for your comment! I think your critique is justified.
My best guess is that this consideration was not salient for most participants and probably didn't distort the results in meaningful ways, but it's of course hard to tell and DanielFilan's comment suggests that it was not irrelevant.
We are aware of a number of other limitations, especially with regards to the mutual exclusivity of different scenarios. We've summarized these limitations here.
Overall, you should take the results with a grain of salt. They should only be seen as signposts indicating which scenarios people find most plausible.