I don't care as long as I control my data and leverage the collaboration opportunities that the cloud gives us. That means I want real files with documented for

I don't care as long as I control my data and leverage the collaboration opportunities that the cloud gives us. That means I want real files with documented formats on my real disk on my real computer and to be able to work with them with other people. And I need to be able to work offline for a couple of weeks at a time. At the moment the only real product on the market which comes close to this is O365. I can literally stop paying for it, disable OneDrive and open all my documents with LibreOffice tomorrow if I desire. The same is not true for Google Docs and iCloud which have complex exit strategies.