Some would care. For example because everyone can read PDF files on his or her pc, without the need for an office suite (MS Office viewer is not available for every platform).
blah blah blah
For companies it can be a cost saver, and I have heard once from someone doing PDF exports at his job, that exporting multi-tab spreadsheets into PDF still goes the most flawlessly with OpenOffice, not with the Adobe software. Guess what the company he works for did? Exactly, ditch the Adobe license for most people, except the very few employees that might still need it.
Actually a lot of major Linux distros ditched OpenOffice and install LibreOffice by default: