In most cases, we use Talend Data Integration for a data integration process, including data migrations from a legacy system to Snowflake as Salesforce site, with most of the usage for ETL purposes.
A specific example of a project where I used Talend Data Integration is when we have legacy systems such as SQL Server, Oracle, and MySQL, where we are extracting data and loading it into the staging area in the Snowflake site. Once it reaches Snowflake, we do some transformation and move the data to a staging area in Snowflake, before publishing the data into the Salesforce site. This is one of the processes we follow for moving data and doing transformations, and during data migrations, we use Talend Data Integration as the ETL tool.
I think it's the main use case; most of the time we use Talend Data Integration for data integration purposes.