Here’s my take on this.
These tools can vary quite a bit in their functionality. On one end of the spectrum, a simple “viewer” might just scrape and organize publicly available profile data—what you could find yourself, but consolidated into one place. This would include public posts, photos, and basic profile information.
On the other hand, more advanced monitoring solutions aim to provide a much deeper look. These are the tools that would show you the “account history” you mentioned, which could include private messages, friend interactions, and a detailed activity log. So, the purpose and the data you get really depend on the specific tool’s capabilities. Some are for surface-level viewing, while others are built for comprehensive monitoring.