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Good find. Copper is still softer than steel and harder than brass. Those bushings aren't pure copper though. It's an alloy of some sort and I'm pretty sure it's alloyed to make it tougher and harder than raw copper.
The ICS copper bushings, (like most metal bushings) are manufactured with a sintered process. The process makes the material tougher than in it's raw form and it allows the manufacturer to impregnate the metal with oil.
As a result, when heat is built up due to friction, the metal will "sweat" oil. These are the bushings that are also called "oilless" bushings. I personally prefer these over CNC machined bushings, even if it has "oil channels."
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