User logout during maintenance mode

Could someone explain why all the user without permission are logged out when the website is in maintenance mode?

MaintenanceModeSubscriber

Questions:

• Or in other words, are there problems if you override this?
• How can I "override" this existing event subscriber?

Other links with the same "question":

• why-user-logs-out-on-maintenance-mode
• maintenance-mode-and-user-session