Since companies have so much power to retaliate against their employees, as you have discussed here, action must be taken to take power OUT of their hands, because as you just stated, they can NOT be trusted with this power, and into the hands of employees. UBI is one way - when companies get uppity they lose employees and no one has to work for them.
You have demonstrated exactly how companies abuse their financial power. It is imperative that we find a mechanism - SOME mechanism - to put more power in the hands of the working class, and to make their lives easier. You've made it quite clear that companies will do everything in their power to prevent this from happening.