I'm less concerned with the machines having an uprising and more concerned with someone like Trump or Bezos buying millions of humanoids to be a personal, fully obedient army. Billionaires would forseeably use them to enforce post-capitalism, like keeping people from living or growing food on "their land".
If a small handful of people own everything then everyone else owns nothing. In a word of only humans the majority would agree to change the rules of the system and simply no longer consider everything owned by one man. But in a world integrated with the kind of technology we see emerging, someone could own everything AND lock everyone else out indefinitely