Hi Yusuf,
Denormalization - this works for any relational database product ... in the case of Druid it can eliminate joins and/or summarize data. Druid doesn't necessarily need that ... but depending on the use case it could significantly improve query performance.
AWS - Druid runs will on AWS instances, both Intel and Graviton based. However if you are looking for a fully hosted SaaS Druid offering you may want to check out Imply Polaris.
Thanks. John