If both google and apple pull out, who will be your monopolist? And what makes you think that they won't also get hammered with legislation?
And even if we assumed that this would be the case, maybe suffering under a "real monopoly" is _exactly_ what the EU needs to push them out of their local maxima. I hope they continue to hammer the ever living shit out of every company that abuses its position to exploit people and deny them their rights. Abusing copyright to prevent people from fixing their own property? Screw every single one of them.
There used to be a saying, if you can’t beat them, join them.
The EU seems to have modified to read, if you can’t beat them, hammer them with legislation until you can.