Open Source vs Open Core
summary
Open core splits an open project into a free core and paid enterprise features so you risk vendor lock-in and an infectious license that forces extra purchases; examples cited include Cassandra and Kafka where vendors like DataStax and Confluent hide costly enterprise bits. Cloud offerings often present a DynamoDB with Cassandra compatibility layer or Cosmos DB equivalent rather than pure Cassandra. Claims include Microsoft having a 4,000‑person open source team and Drupal boasting about 115,000 contributors.
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