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https://www.pcmag.com/news/wtf-do-i-have-to-pay-for-microsofts-defender-antivirus-now
https://i.ibb.co/FBXRzWd/Virus.png
maybe your pc is infected with malware
Edit: Read the link Wolfpig gave, it explains things to you. Basically it's an advert for Defender so you know it can also be used on non-Windows systems, and that's paid. Simply put, Defender is free, cross-platform Defender is not.
As for most games only working on Windows, the truth is that while most games are written solely for the Win32 API, a large portion of them, even some DirectX 12 titles thanks to a translation layer, can run just fine on Linux, though in my experience the compatibility layers do seem to add stutter from shader recompilation.
The article also talks about the basic Defender being free. It's in the "Windows Users Need Not Worry" part of the article.