I get you are in denial they have a monopoly. For instance Microsoft only has about 65% market share and everyone considers them a monopoly
"A monopoly describes a market dominated by a single seller or producer that controls so much of that market share, anywhere from 50% to 100%, that it faces no meaningful competition."
At this point you could even argue they have become a natural monopoly as they have not used a lot of anti-competitive practices. The only way to protect consumers is government regulation at this point since no competitor can reign them in.