There's nothing wrong with a healthy dose of skepticism and situational awareness.
But, at some point, one needs to temper with a bit of common sense one's paranoia about MS, every computer software company and every 3-letter government agency "spying" on one's PC.
There are probably a few billion internet-connected computers (and devices!!!) out there.
Unless you have a few million dollars in your checking account or something else of real value or you're engaging in CP, the bad guys/good guys/MS/AV vendors probably are not interested in checking your browsing history or in reading your emails on your personal computer.
If one goes online, someone, somewhere will probably see the links you click, items you search for, sites you visit, etc. It is a fact of life in 2017.
Many people seem to spend countless hours obsessing about being spied upon by ___ (a largely theoretical concern for the average user), rather than on devising and implementing a common-sense, "best practices" strategy to keeping their computers, data and identity safe from ransomware attack, malware infection or other, much more REAL, tangible threats.
At the end of the day, one either needs to put some modicum of trust into reputable companies and their security products and "safe hex", or one needs to strongly consider disconnecting entirely from the internet, to be truly "safe".
Well i kind of disagree with that last post on many levels but i do know what you mean about 100% disconnecting to be safe from being spied on when it comes to the internet, min you start using the net theirs limits to how much privacy you can have, at the same time you can go full stealth mode if you want if you know how to but theirs are limits to how far i want to go on that topic, in any case you can't really serf the net in full stealth mode, iv tried and everywhere i go i get blocked cus everyone thinks im a bot cus they can't tell who or what i am.
Douse that mean ill use win10, no
Douse that mean i want to be part of a defensive botnet for the AV guys, no
Douse that mean ill install free to use software or online games that phone home and data mine all over the place, no
I run 4 firewalls back to back for a reason btw, its so i can see what people are trying to do.
Anyways going a bit off topic so back to topic.
Good read here on this link as to what the AV guys are up to of late in regards to phoning home and data mining.
Ps: Avira installer doesn't install any 3rd party junk as far as i know and no popups, just don't sine up for cloud and block everything on a firewall level and your golden if you care about your privacy, do updates manual stile.