[WPMU DEV Dashboard] Uninstall WPMU Dev Dashboard

I deactivated the WPMU Dev on one of my client's sites because they are no longer a client. How do I remove it altogether so that it does not show up in the back-end?
Also, I'd like to leave the following plugins: Defender Pro, Smush Pro, Hustle Pro
Do these plugins automatically turn to FREE plugins once I remove/logout of wpmu dashboard? Realizing that some functions wont work, I'd like to leave these for them out of courtesy if they auto turn to free plugins.

Please let me know on how to delete the WPMU dashbard and about the 3 plugins. THX!