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This is not about Google having a monopoly but about Google abusing a dominant position.

And even if it were about monopoly, whether or not you are forced to use a product or a service is not what determines if it constitutes a monopoly.

The concept of "Monopoly" in U.S. antitrust law and the concept of "Dominant position" in EU law are basically the same.

And whether or not you are forced to use a product is a large part of what it means to have a monopoly: https://en.wikipedia.org/wiki/Switching_barriers