These things are being developed to make money for the company investing so they'll be no different than companies developing GMO's. You'll pay for the tech and the ability to operate it and doubt wont be allowed to fix it.
Don't pay your monthly fee on time or agree to the price rise, well they'll just 'switch them off' just when you need them.
At least with a seed, once its in the ground you're pretty safe.
You already have low labour and machinery costs, do you think robots will reduce that further?
Once everyone is using it, prices for your produce will adjust to compensate for any COP advantage (if there is one) because as farmers you're competing against each other.
Robot tech won‘t belong to one provider, just like the tractors they replace it will be a competitive market
the trouble with GM etc is single big companies end up in exclusive control of the IP