The problem of so-called "break-up" option is that there are not many buyers who can afford operating those services (those costs at least billions every year even if those could be purchased for free) and those who can afford are already serious monopolists. Imagine MS buying Chrome, Meta buying AdWords, Apple buying Android etc etc. You probably don't want that.
Other feasible way to avoid this would be keeping Google ads to subsidize them, but then what's the point of change? This is why the remedy should touch very specific illegal practices. Structural changes need proper legislation which targets the entire market. Otherwise, you'll just see balloon effects in action.