[enragedcacti]

We force companies to incur costs for the public's benefit all the time. In special cases we even require them to serve loss generating customers as a condition of operation. No one is forced to operate a power company, but if you do you are bound to provide power to customers regardless of their individual profitability. Similarly, dominant vertically-integrated messaging systems could be required to provide interoperability at a reasonable charge (or even no charge!). Apple could then decide whether or not they want to operate a system under those terms.