Is ECMO considered life support?

I understand that ECMO, or extracorporeal membrane oxygenation, is a complex medical procedure that can help patients with severe respiratory or cardiac failure. But I'm curious, is ECMO actually considered life support? I mean, it's obviously a very serious and intensive form of treatment, but does it fall under the umbrella of life-sustaining measures? I'm trying to get a better understanding of how ECMO fits into the broader picture of critical care and end-of-life decisions. Can you help me clarify this?