They are building huge moats around their business ( Android, Chrome etc ) so it becomes harder to use some Google products without using others.
Google discontinued 'Google Sync' ( https://support.google.com/a/answer/2716936?hl=en ).
It favors Google Finance and Youtube over its rivals in search results page.
They 'have not figured out' how to allow extensions in Chrome mobile.
They had no-poaching agreements with rival companies.
I am almost a Google fanboy, but I suspect they will be no different to Microsoft in a few years. Letting products stagnate, pushing the tech industry backwards but making a pretty profit for investors.