Open-source technology is gaining popularity in the data integration industry due to its benefits such as ownership of data, communities for problem-solving, and cost savings. This article investigates the reasons behind open source's adoption success and focuses on open-source vs closed-source ELT (Extract, Load, Transform) solutions. Open-source ELT allows greater control over the data integration process, more efficient data processing, and cost savings for organizations. The growing trend of open-source ELT adoption in the industry is also examined, along with its future prospects. Airbyte, an open-source platform, offers numerous connectors to tackle the long tail of connectors that closed-source solutions often neglect.