[scholia]

I don't think the two are comparable. LibreOffice is still a rather poor (in my view) 1990s office suite. Office 365 is a modern ecosystem that includes a more powerful suite of office programs with much better ease of use, a 50GB mailbox, 1TB of online storage, the great integration of email, OneDrive and online software, the ability to stream Office programs without installing local copies, plus the cross-platform tablet and smartphone apps (ie including Apple and Android).

Buy Office 365 Home and you get all that for five people, which could mean your family or flatmates.

You can't get all that stuff from LibreOffice. As a matter of fact, you can't get it from Google either.