Limited Members can see all the other Workspace users (literally all of them, including their emails) under "Space Settings" -> "All Space Settings" -> "Owner" in the dropdown menu.

More details can be found in the support ticket #2335424

This makes it impossible to work with several clients in one account (for example, for a management agency where you need to manage several clients at once). All the client users who have the Limited Member rights can see their competitors.

This is a huge security breach. There must be a restriction for Limited Users to see the rest of the Workspace users.