First time I hear about Euro-Office. I wonder if that's a serious project or just fishing for EU funding.

The fact that the addictional terms are basically designed to defeat the original licence should make it clear to anyone that it isn't a "reasonable legal notice".

IMO this is a great illustration of how the word "reasonable" stops the entire legal system collapsing.

Quite clearly OnlyOffice never wanted to have a fully free software office suite. The (mis)use of AGPL has always been a marketing trick and nothing more.