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FTC bans antivirus giant Avast from selling its users' browsing data to advertisers
(techcrunch.com)
This is a most excellent place for technology news and articles.
That you know about.
Don't assume you are fine just because your antivirus doesn't alert you about viruses.
This goes for every AV, not just Defender.
That being said, I am also just using Defender snd it has worked well.
I used to run F-Secure, and I like it, but eh Defender is good enough.