Spam filters don't and should not have some global default whitelists that bypass all protection. One simple reason would be that someone's account is compromised and it sends out malicious mail.

I have seen Microsoft Defender spam filter detecting legitimate Microsoft mails as spam. It's just how spam filters work, there always can be false positives.

How would they know that europe.eu is a legitimate government website? Anyone can register a .eu domain. If it ever expires, anyone can buy it. And even if they built a team that whitelists government websites, do you really want to have spam from them whitelisted? What if they get hacked, what if they use spam for military disinformation campaigns.

My point being: One email doesn't even tell you if their service sucks. Much less that Google is an enemy service and must be banned.

There are plenty of reasons to not use Google. There are even a bunch of reasons to ban Google. One false positive in their spam filter is not one of them.