As you may have recently read regarding the recent release of SharePoint 2016, the SharePoint Foundation SKU is no longer available with this new release!
This basically means that all current companies/organizations that use the SharePoint Foundation platform will not be able to upgrade to the same SKU in SharePoint 2016! Therefore, the last version they can use of SharePoint Foundation will be SharePoint Foundation 2013. This, of course, prevents them from using all of the new feature support available in SharePoint 2016 such as the larger database scalability improvements as well as a whole host of other features.
If you would like Microsoft to bring back the SharePoint Foundation SKU, then you can vote for this UserVoice item here: https://sharepoint.uservoice.com/forums/329220-sharepoint-dev-platform/suggestions/14128419-bring-back-the-sharepoint-foundation-sku
This basically means that all current companies/organizations that use the SharePoint Foundation platform will not be able to upgrade to the same SKU in SharePoint 2016! Therefore, the last version they can use of SharePoint Foundation will be SharePoint Foundation 2013. This, of course, prevents them from using all of the new feature support available in SharePoint 2016 such as the larger database scalability improvements as well as a whole host of other features.
If you would like Microsoft to bring back the SharePoint Foundation SKU, then you can vote for this UserVoice item here: https://sharepoint.uservoice.com/forums/329220-sharepoint-dev-platform/suggestions/14128419-bring-back-the-sharepoint-foundation-sku