google/ksp is an open source project licensed under Apache License 2.0 which is an OSI approved license.
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news.ycombinator.com | 2021-02-13
Kotlin Symbol Processing (KSP) now in alpha
According this table Room is already working on it and Moshi has experiment support for it. I can't see treating the input as read only being a blocker for any of the annotation processors listed here.
Curious where does the `is approximately 2x faster than KAPT.` comes from. Github is mentioning 25 percent. https://github.com/google/ksp/blob/master/docs/why-ksp.md