Why does bitdefender let me download Brave so easily but not Librewold?

So i downloaded Brave on windows 10 a few months ago and i remember that it was pretty easy without any hiccups but last week when i tried to download librewolf a message poped up saying that it may be harmful for your computer even tho i downloaded it from the official source

Is it just me or is microsoft getting more and more desperate to collect our data?

*Edit: Sorry it wasn't bitdefender it was something like Antimalware service executable or something like that which i think is a microsoft product