Imagine for a sec that you are a trades person (plumber, electrician, carpenter, or the like) and you are meeting with a prospective client when they spring the following question on you: "tell me why you want to work on my house specifically and not one of my neighbour's houses instead?" It's a weird thing to ask, right? It's kind of understood that this is just a job and that you would be contented to ply your trade for any client who is reasonable to work for.
You probably see this next point coming from a mile away: certain tech companies ask questions of the form "why do you want to work at X? what's special about us?" of their software developer job candidates and it's toxic for much the same reason that it would be toxic to interrogate your plumber about why they came to work for you. Some tech managers may believe that people who really "want" to work for them will make sacrifices and do more work for less pay. The reality is that few, if any, of these companies are offering jobs that people would still want to work at if they did not need to make a living. Wanting to do tech work primarily because it is lucrative is fine.
I find myself doing a double-take when asked this sort of thing during a job interview process. Clearly I want the job, I am spending valuable time and brain cycles on the interview process. Moreover, we should be talking about how valuable I am, because the potential upside to employing somebody like me is enormous. Most employers would be lucky to have that opportunity.
Generally speaking, don't settle for a job where your employer treats you like you're easily replaced. If they really believe that, they're delusional and you should get out as soon as you can. When they're already asking you to talk about how great they are during a job interview, that whole "you're not special, we're special" thing has already started. Just walk away and let that employer be somebody else's problem.