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The libreoffice.org site was my first result in Duck Duck Go search.
Do you have ad blockers? The EBay link and Microsoft link are both ads, which is why they appear first. I do get results similar to this if the ad blocker is disabled, but with Amazon instead.
adblocker here and using the same term op used i get nothing but legit libreoffice.org links (including the auto-generated wiki info at the very top) all the way down the first ddg serp... except the last entry on that page, which wsa an seo operation using libreoffice content to game google and promote totally unrelated links.
Same, and that was whether I searched with or without a space between 'libre' and 'office'. In fact all ten results on the first page of results were directly related to the software - either links to the site itself, or reviews of the software.
It also somewhat embarrassingly revealed that the page title for us.libreoffice.org is "Home | Your Site Name - your tagline here"...
same