They are like s3 buckets, but you write iceberg tables. They will do maintenance for you, make it available in AWS Glue for querying via Athena, etc.
Instead of $23.5/TB/month for normal s3, it's $26.5/TB/month for s3 tables. That's cheap. They charge for compactions and other table services, but are cheap.
AWS have been falling behind Databricks-Snowflake at the higher AI layers, but going low (metaphorically and literally) this puts the cat amongst the pigeons with them. At what point should the competition lawyers look at this?