All of the others are relatively easy to avoid using.
That’s not the same thing as to avoid giving them any information about you. For example, any time you see one of those little Facebook “like” icons on a page, it means Facebook knows you visited that page, even if you don’t have a Facebook account. But that’s relatively innocuous, and not every website has such an icon. Oh yeah, and Facebook owns Whatsapp, but there are alternatives for that as well.
But Google gets notified of pretty much every single webpage you visit, via AdSense and Google Analytics and Google APIs, plus they own the Blogger platform and a bunch of other stuff. And of course it is the default search engine for the vast majority of people, even if they run Safari.
If you have an Android phone, then Google knows about every move you make and every breath you take, and they probably have all your passwords as well. (Because even when you decline to let them helpfully back those up in their cloud for you, it periodically comes out that they “accidentally” uploaded them anyway. Oops, our apologies, we fixed the bug, lather rinse repeat.)
If you have an iPhone, you might be slightly better off because at least your private data will be divided across the servers of two different companies, so it’s slightly harder for a single entity to combine all that information together. But even then, you’re probably still using Safari and you may still have a gmail address – and even if you don’t use gmail, undoubtedly a large percentage of the people you correspond with do, so Google has your side of the conversation anyway.
Google may not be more evil than the other companies you listed. They’re just the one which is in a position to do the most damage.
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It would require legislation to ensure actual privacy online.
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Yeah, but how likely is that, given that all the secret services of every country’s government are all competing with each other about who can most obsessively invade their own citizens’ privacy, just in case one of those citizens might turn out to be a terrorist or a child molester some day? The best you can hope for is legislation which says that the government is allowed to spy on you, but nobody else is.