The utility of Amazon is really apparent in these responses. I think the "how much would you care if company {x} disappeared" is one of the most interesting questions. I imagine this is how people feel about that:

Apple - iPhone / Mac loyal users would be disappointed but know that Android devices and PCs have gotten pretty good lately, not the end of the world.

Google - has all your online accounts, mail, calendar, docs, etc. Losing this would be a massive pain, but it's not too hard to imagine some other software company stepping into the void.

Amazon - the everything store. If this goes away many people will have to reorganize their physical lives. More trips to the store, back to waiting weeks (not days or hours) for niche items, paying more for almost everything. Most importantly, it's very hard to imagine any other company developing a logistics network like Amazon has.

I would have liked to see Uber/Lyft included in the survey. Although I have a pretty negative opinion of the "ridesharing" industry I can't really imagine what would happen to urban and suburban life if they just disappeared. So many of my plans these days rely on the fact that I can summon a car to take me somewhere without any planning, and it's not going to be horribly expensive.