Google absolutely is, but through lobbying they have managed to retain an antiquated definition of what the “market” is. I.e they would say it’s the mobile market, whereas the reality is that it’s now an “android” market and an “iOS” market.
That’s exactly what the EUs “digital markets act” was created to address. In a true market there are no walled gardens, the market is accessible to all.
Personally I think it’s not enough and that they should also be split up. Ideally I feel any corporation should be restricted to a single market segment or trade category.