Using and maintaining Matano is a fraction of the cost compared to popular non-serverless alternatives like ELK or Spunk. Matano is specifically designed for petabyte-scale security analytics use-cases that don't fit in a traditional SIEM.
The serverless data ingestion pipeline means you don't need to over-provision for ingestion (Logstash and Splunk Forwarders are notorious for related costs / ops in high scale use-cases) in the write path. For reads, since Matano queries Iceberg tables backed by highly-compressed parquet files on object storage you won't pay anything close to what you would for a database or search engine based SIEM.