Imagine however, that a machine objectively makes the better decisions than any person.
You can't know if a decision is good or bad without a person to evaluate it. The situation you're describing isn't possible.
the people who deploy a machine [...] should be accountable for those actions.
How is this meaningfully different from just having them make the decisions in the first place? Are they too stupid?

I think there may be some social issues with a for-profit company being financially incentivized to promote and sell pedophilia to people.
How would you rather deal with this? A boycott? Do you have money in child sex doll manufacturing that you can withhold?
That's not really what this is about. You're trying to assess this on a personal freedom level when what we're talking about is a guy with a megaphone.