Many enterprises are moving away from thick client office software and moving to browser based office software with cloud backends. Google apps, Zoho, OnlyOffice, Bitrix, and Microsoft all have very usable cloud offerings. Collabora is trying to build an LibreOffice based cloud offering, but LibreOfice remains old-style "thick client" software.
Apache OpenOffice is still available and free. LibreOffice is a fork of OpenOffice, and gained marketshare by building goodwill with users who did not trust Oracle or (to a much lesser extent) the Apache Foundation.
Having three "enterprise" partners to buy from makes it hard. I don't have a business relationship with CIB, Collabora, or Adfinis SyGroup, and honestly, I don't know why packaged office software would require one.
In short, I think there's a deep marketing problem here, and a misunderstanding of something fundamentally different about free software (using the Stallman meaning): it is possible to have widely used software that is critical to a user, but where that user is not willing to pay for it. This is because the user selected it because it was free (as in freedom) and the user knows they do not have to cooperate with a market capture by a developer.