[j_walter]

Not so sure. AMD is always free to build a fab to make their own chips. It's perfectly reasonable to refuse to serve a direct competitor...or offer the service at a huge expense that would make it unreasonable for the competitor.

[simonh]

There is extensive legal precedent, and numerous outright laws in many jurisdictions restraining anticompetitive practices such as this.

[ClumsyPilot]

'AMD is always free to build a fab to make their own chips.'

By that logic there us no limits on a monopoly abusing its power, after all you are always free to create your own water supply company, electric distribution company, etc.