There's also multiple existing federal agencies that aggregate data across multiple federal agencies (OBM oversees federal data collecting https://strategy.data

There's also multiple existing federal agencies that aggregate data across multiple federal agencies (OBM oversees federal data collecting https://strategy.data.gov/overview/ https://strategy.data.gov/overview/, GSA also centralizes federal datasets, OPM collects gov wide workforce data, etc). Aggregating gov spending data in a similar way is not a totally alien idea or even a new one... even if the concerns on data security and transparency are valid.