I also think if we're being charitable, AWS would be split off from Amazon, and possibly sub-divided further, likewise for the other public clouds -- Google search and Google Cloud shouldn't be owned by the same entity, etc.
Facebook buying Instagram and WhatsApp is essentially them buying out their competition.
Google running a cloud service is more like renting out excess capacity – which is quite common across industries. Plus there's a lot of competition in the cloud space.
If that were actually the case, then sure.
But it's not. Alphabet's Google Cloud services have whole data centers dedicated to renting to the public and Alphabet's Google and other businesses entities are their own customer.
You'll be <<very>> tempted to do things to the platform to favor your own services.
The incentives are so strong I don't think we've even invented things to prevent this on a long enough time scale.