RethinkDB was so promising and still is in a way. It just didn't take off as an open source, openly government project (yet). It's still early though. I hope it

RethinkDB was so promising and still is in a way. It just didn't take off as an open source, openly government project (yet). It's still early though. I hope it forms a great community around itself and becomes a major open-source database offering. Apache or CNCF adopting it wouldn't be the worse thing ever even though not a super CNCF like product.