This is not typically going to be stored in an ACID-compliant RDBMS, which is where the most common scaling problem occurs. Search engines, document stores, adt

This is not typically going to be stored in an ACID-compliant RDBMS, which is where the most common scaling problem occurs. Search engines, document stores, adtech, eventing, etc. are likely going to have a different storage mechanism where consistency isn't as important.