Snowpipe use server less architecture and therefore doesn't consume a virtual warehouse compute

Failsafe is different from time travel and provides protection against failures. https://docs.snowflake.net/manuals/user-guide/data-failsafe.html

Since snowflake uses cloud based storage like Amazon S3 or Azure Blob storage, the amount of space available to Snowflake is virtually unlimited.

Cloning a schema clones all the tables in the schemas and all other cloneable objects in that schema

https://docs.snowflake.net/manuals/user-guide/object-clone.html#access-control-privileges-for-cloned-objects

COPY command uses virtual warehouse resources, Snowpipe is billed separately and doesn't use virtual warehouse resources

Incorrect. Only one instance of data per cloud or region has to be replicated. Once the instance is replicated more then one consumer can make use of this data

Either type of UDFs (JavaScript or SQL) can return Scalar or Tabular results https://docs.snowflake.net/manuals/sql-reference/user-defined-functions.html

As soon as the virtual warehouse is in a running state it starts consuming snowflake credits

Incorrect. Failsafe can not be disabled for the Account or a database or a table. It is a Snowflake feature that is always present. The only tables that don't have failsafe (by default, and this can't be configured either) are transient and temporary tables.