Column Template Questions

Our users would like the ability to create customized column templates, both for their own workspaces and make some of them available org wide. I have a few related questions:

  1. Is it true that once a column template is created, it cannot be modified, however, when a column is added to the board using this template, you can add/delete values at the board level without impacting the original template?
  2. Is there a way for admins to see who created the templates? Currently, I don’t see an option (Enterprise tier)
  3. When a column template is deleted, the columns that have been created from that template across the various boards will not be impacted - Is this correct?

Thanks in advance!