Playground's bigger question is the platform around the games: where people play, how they find them, and whether the whole thing takes off. These are my questions about the announcement—not announced monetization terms.
Spark demo footage supplied by Unity; pre-release version, with my commentary.
Full breakdown: https://youtu.be/ESr-JxuIQg8 (also linked as this Short's related video)
Unity Spark: https://unity.com/spark
Google Playground: https://playground.google.com
Roblox Assistant: https://create.roblox.com/docs/ai/accelerated-workflows
This is an announcement discussion, not a hands-on review. Spark beta availability and features can change.