> If Google owns Search, Gmail, Android, Analytics, Chat, Google Fi, Google Fiber, Chrome, GPay, etc... then they are able leverage one monopoly to establish monopolies elsewhere.

You're right that Google leverages its portfolio of services to get a foothold in other ventures, but not one of those listed above is a monopoly. There are solid and well-performing alternatives/competitors to nearly all of Google's services. Their (and Facebook's) online advertising business is another story.