The robots would never be built if the capitalist system didn't provide the incentive and rewards for innovating the products (robots) needed by society.
Capitalist system DO provide a lot of incentive to develop robots because they almost guaranteed will be sold with a profit if their cost + maintenance will be lower than workers' wages (including perks, insurance premiums, taxes etc).
Sold to whom? If robots end up making it so that no one can afford to pay for anything, then robots are not the most profitable option, is it.
The problem is that capitalism creates secrets Because if your customer can find your source or how to do it themselves They can just reproduce it
So eliminate that secrecy factor and everyone can just make their own robots
I have heard of people building their own cars from scratch in the middle of buttfuck nowhere
If robots became as common as cars Cities like Detroit would start pumping them out and schematics would be all over the place