1. The reason that Am..on (creator of Dynamo), G..gle (creator of Bigtable), and F...book (creator of Cassandra) allowed their employees to publish academic papers about the new breed of database technologies is that technologies were custom-made.
A custom-made technology is created specifically to meet some peculiar business strategies and cannot be utilized elsewhere.
2. The reason the companies did not keep these technologies as proprietary secrets is that other companies cannot use the technologies in their businesses since they were created to meet specific business requirements.
Database technologies are technologies that collect, store, organize, and process information and unstructured data for defined users. Some database technologies come in many shapes and sizes. Examples of database technologies include Dynamo, Bigtable, and Cassandra.
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