While I agree that the concern is overblown I see where they're coming from. I think the issue is less that there's such a big potential for misuse and more that there aren't any positive uses for this technology. The only possible non-sexual use for a humanoid robot is to impersonate someone. The design simply isn't any good for anything else; it's top-heavy, it's slow, it's overengineered, and it's limited in the number and scope of its manipulators. (And even for sexual uses it's overengineered and overexpensive compared to technologies that have existed since 1995; so that really just limits it to espionage)
As I said at the beginning...Assassination Droids!!!!
forever stuck in stasis of the current tech level then...
Like the Imperium of Man!
Actually, being more serious on the topic...
I can think of several real reasons to have Robots developing in the direction of Moya.
#1 - As so many in the thread have already pointed out, it could be utilized for certain purposes. However, I think it's more than just that type of self-indulgement purpose of exploitation. Have you seen Serenity (Firefly Movie). In it you have an isolated individual who's only real comfort (and who they consider as a real person) is their humanlike Robot. In today's society there is a growing number of people that will not find a companion and many that don't have a friend. Even if it's a Robot there are those that this may actually help them with companionship, friendship and having someone (or something) there that they can have to talk to and simply be around.
#2 - As ugly as it could be, unless we could prove that Robots with AI become self aware (in which case, in this type of instance we may have a SkyNet or Geth (Mass Effect) situation), I expect we would use them as slaves. There is a segment of humanity that, in all it's ugly truth, wants to have a lower class that they can command and boss around. They don't want some "robot" that doesn't look human, but something that actually is human (or humanlike in appearance). They would use these for all our menial jobs, all the servant (housekeeping) jobs, etc.
They want something that would look like us, but that does the work.
#3 - Just as sinister, once you buy a robot (see slavery in #2) you only have to pay for upkeep. You don't have to pay it. We already use robots in factories (that don't look human) but people want to see a person if they go into an office. If we could replace those hospitality workers (for example, restuarants), those cashiers (and I think Amazon already tried something like this with automatic checkout, others are trying something similar with self-checkout but would prefer something where people cannot sneakily shoplift past the cameras), and maybe even doctors and nurses if the AI gets advanced enough with robots a bunch of rich people would be very happy with that result.
I can think of a lot of scenarios where people would prefer a Robot that looks like them to something that doesn't.