The only reason is Apple. They liked the product that was released in 2013 so much they bought the whole company, and all other FoundationDB users were abandoned and were forced to drop it.
Who would trust a database that can be yanked out of you at any moment? Though a lot of products have license terms like this only a handful were ever discontinued so abruptly. It's under Apache license now but the trust is not coming back.
The only reason is Apple. They liked the product that was released in 2013 so much they bought the whole company, and all other FoundationDB users were abandoned and were forced to drop it.
Who would trust a database that can be yanked out of you at any moment? Though a lot of products have license terms like this only a handful were ever discontinued so abruptly. It's under Apache license now but the trust is not coming back.