When the OSS is alive but the license isn't: Sentry, MongoDB, Elasticsearch, Redis (May 2026)

Short summary

Four major infrastructure projects—MongoDB, Sentry, Elasticsearch, Redis—switched from permissive to restrictive open-source licenses (2018-2024) to block cloud vendor competition. The impact varied: where cloud vendors co-forked (Elasticsearch→OpenSearch, Redis→Valkey), ecosystems thrived; where community alternatives emerged (FerretDB, GlitchTip), adoption stabilized; early cases without alternatives (MongoDB SSPL) genuinely fragmented self-host adoption. Teams already running these projects have drop-in migration paths documented, with practical guidance for each technology and version level.

• •Open-source licensing shifts didn't consistently decay ecosystems when cloud vendors or community alternatives stepped in
• •MongoDB's SSPL fragmented adoption; Elasticsearch and Redis forks (OpenSearch/Valkey) thrived; Sentry's FSL has usable alternatives (GlitchTip)
• •Practical migration guidance for each technology with version-level specificity for teams evaluating or migrating infrastructure

Generated with AI, which can make mistakes.