Astria, a shared sequencer built on Celestia, has announced its shutdown, raising concerns about the viability of modular blockchain infrastructure. The project, which launched its mainnet last year, did not specify reasons for ceasing operations, though previous development halts hinted at underlying issues. The closure underscores the technical and economic challenges faced by decentralized infrastructure projects. Despite Astria's shutdown, Celestia's data availability layer continues to be utilized by other projects, and the concept of shared sequencing remains valuable. This development serves as a reminder of the complexities and high stakes involved in the evolving crypto landscape.