Thank you for documenting this proposed framework. Agree that it would be very useful to have a defined framework for rollup classification as they progress through various stages of training wheels.
From the Coinbase perspective, this would be a valuable resources for presenting our users with a standardized risk assessment as they interact and move assets across different rollups. We would be excited to collaborate on fleshing this out and making this a resource that can be standardized across the broader ecosystem.
As currently specified, this seems like a reasonable v0 that we can expand on. One additional requirement I might suggest would be to encode something about the fraud proof or validity proof mechanism being available in such a way (e.g open source) that it can be reviewed by 3rd parties.