Google officially "shelved" Project Ara in September 2016. Despite a briefly revived developer edition, the project never reached the mass market due to technical hurdles like the bulkiness of the modules and the complexity of making them talk to each other reliably.
Originally, Google aimed for a $50 "grayphone" starter kit, but that never materialized for consumers. Why Google Canceled Project Ara : r/Android
The Dream of the Modular Phone: Can You Still "Buy" Project Ara in 2026?