Muse Spark Open license: $20M revenue triggers a separate deal with Meta
Meta's open-weight Muse Spark Open is free to download, modify, and sell copies of — but companies serving it via API whose total revenue exceeds $20M in any 12-month period must notify Meta and sign a separate agreement first. The threshold covers all company revenue, not just model-serving income. A licensing detail every builder planning products on the model should know.