Rich people are not evil. Some may be. Most are not, at least not to the extent you imply. Many rich people are doing good things with their money and time. They have the power to resist the evil ones.
I don't mean to condemn them, genuinely charitable billionaires are doing a lot to improve living conditions around the world, but most of them aren't doing much to oppose the people who use their money to buy laws, lawmakers, and governments. (What they even could do without using the same corrupt tools is an open question.) A world with no hunger, no disease, and an absolute dictatorship of the wealthy is no utopia.
How would the good rich people resist the evil rich people? Perhaps by striking first and eliminating them?
You see where it goes?
A structure where anyone can build a world-destroying monster implies that anyone remotely evil has to be destroyed, right? But that suddenly starts to look exactly like the program of "evil".
It seems like future will look like: benevolent dictatorship, butlarian jihad or end of humanity (and I wouldn't bet on robot survival either).
