I‘m more and more of the opinion that oligolipolies (multi-monopolies) should be treated the same as monopolies. Just because there is more than a single provider still does not mean there is a free market and consumers have actual choice. Google and Apple both pull extremely anticompetitive behavior lately and the excuse of „just switch to the other side“ bypasses reality. There are quite a lot of studies that free markets start working only if there are more than 4 parties left to compete with significant market share.

Citations missing since I‘m on mobile.