To answer your first question : no, there's absolutely no wat to determine if a version of Office is cracked or not by looking at the files made with said version. Tho Microsoft can see if a cracked version sends telemetry but they don't care about it. You can use it freely.
And honestly, LibreOffice is 1 to 1 compatible, you just have to install Microsoft's proprietary fonts.
You're talking about "Nazis" so much it looks like you travelled straight from 1942 to now just a few moments ago and do not yet grasp the fact that Bluesky would obviously ban them since it's like a big monolithic Mastodon instance
It's extremly easy to determine if something is "queer friendly" or not, event if you're not a queer yourself. By your flawless logic, I should not be able to discern the presence of racism in a KKK meeting because I'm not black lol.
I see a lot of people complaini gbhere, and, admitting that most of you might have Androi based phones, I'd urge you to install Youtube Revanced, they have a Github :
https://github.com/NoName-exe/revanced-extended
To answer your first question : no, there's absolutely no wat to determine if a version of Office is cracked or not by looking at the files made with said version. Tho Microsoft can see if a cracked version sends telemetry but they don't care about it. You can use it freely. And honestly, LibreOffice is 1 to 1 compatible, you just have to install Microsoft's proprietary fonts.