It's not a cancer, let's keep things in perspective. Google is simply following the well worn path of all monopolies.
@ichthyous
+1 for your perspective, but I see things differently. A monopoly will do as you suggest - squeeze as hard as they can. Cancer spreads.
Google (Search) has spread to have the leading web browser (Chrome), email service (Gmail), mobile operating system (Android), online video service (YouTube), etc. It's this spread beyond search, or as I call them mini-monopolies, that I see as cancerous.
As @mosxu noted above, Google has many different data collection points across the web. How this data is collected and used to personalize search results for users, and throttle traffic quality/conversions for websites, is anyone's guess. But I do know I can't even log into my online bank account without first going through a Google point of entry (reCaptcha). Additionally, my website processes credit card transactions through Stripe which is a Google Ventures company. What data is shared with Google as the result of that investment? Is consumer credit information shared with Google as the result of Google Capital's investment in Credit Karma or data collected from surveys with Survey Monkey? My host recently switched to Google Cloud without any advance notice and many website owners were upset because they simply don't trust Google. Oddly enough, some of these webmasters use CloudFlare which they don't even know is part of Google Capital's portfolio.
Considering all the above, plus much more that I did not mention, Alphabet/Google makes all prior monopolies look like entry level businesses. Besides the Alphabet/Google owned companies, take a look at the other companies they are invested in and may collect data from.
Google Ventures: [
gv.com...]
Google Capital: [
capitalg.com...]
Not surprisingly, conversions on my website from Google are terrible today after a good couple of days. Instead of sales on my website today from Google, Amazon orders keep coming in with a number pending as I speak. Considering I had a really good day yesterday with Google traffic, and I mean really good, I expect Google to direct most/all converting traffic to Amazon for an entire week to a week and a half.