I'm afraid antiviruses spy on you, especially free ones.
Windows spies on you more than any antivirus software. Windows is a privacy nightmare. Check out the links I shared in
this post. Even if you try to sanitize Windows, turn off all the extra features, block or disable as much of the privacy invasion as you can, it still transmits data back to Microsoft and a variety of third parties about your device and what you are doing on it hundreds or even thousands of times an hour.
If you are using Windows, then whether your antivirus is spying on you is the least of your concerns.
Yes but sadly for the people they only choose between the "less bad", so instead of share their info with X they want to share they info with a big tech, because you know..... "its a wellknow and reputable company..."

But its understable thinking about they are not gonna scam you but if you have one problem with goverment.... GG for you. Anyways i think the mos flawed privacy we have its in the smartphones and with google, we spend more time and we generate much more info in smartphones than in PC.