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Apple Search

Google, Google, Google
For well over a decade Google has dominated search to where most stories in the search sphere were about Google or something on the periphery.
In 2019 Google generated $134.81 billion in ad revenues.
When Verizon bought core Yahoo three years ago the final purchase price was $4.48 billion. That amount was to own their finance vertical, news vertical, web portal, homepage, email & web search. It also included a variety of other services like Tumblr.

Declining Visitor Values

Late Funnel SEO Profits
Before the Panda update SEOs could easily focus almost all their energies on late funnel high-intent searches which were easy to monetize without needing to put a ton of effort into brand building or earlier funnel informational searches. This meant that SEOs could focus on phrases like [student credit cards] or [buy earbuds] or [best computer gaming headphones] or [vertical computer mouse] without needing to worry much about anything else. Make a good enough page on those topics, segment demand across options, and profit.

How to Read Google Algorithm Updates

Links = Rank
Old Google (pre-Panda) was to some degree largely the following: links = rank.
Once you had enough links to a site you could literally pour content into a site like water and have the domain's aggregate link authority help anything on that site rank well quickly.
As much as PageRank was hyped & important, having a diverse range of linking domains and keyword-focused anchor text were important.
Brand = Rank

Easy for You

To Teach, One Must Learn
One of the benefits of writing is it forces you to structure your thoughts.
If you are doing something to pass a test rote memorization can work, but if you are trying to teach someone else and care it forces you to know with certainty what you are teaching.

New Age Cloaking

Historically cloaking was considered bad because a consumer would click expecting a particular piece of content or user experience while being delivered an experience which differed dramatically.
As publishers have become more aggressive with paywalls they've put their brands & user trust in the back seat in an attempt to increase revenue per visit.

China Still Censoring Google, Now Globally

Google Gets Out of China
In March of 2010 Google announced they would no longer censor their search results for China:

earlier today we stopped censoring our search services—Google Search, Google News, and Google Images—on Google.cn. Users visiting Google.cn are now being redirected to Google.com.hk, where we are offering uncensored search in simplified Chinese, specifically designed for users in mainland China and delivered via our servers in Hong Kong.

Increasing Time on Site

Changing User Intents
Google's search quality rater document highlights how the intent of searches can change over time for a specific keyword.
A generic search for [iPhone] is likely to be related to the most recent model. A search for [President Bush] likely was related to the 41st president until his son was elected & then it was most likely to be related to 43.
Faster Ranking Shifts