Site Login Behavior Inquiry

The Darkness
The Darkness -
Lunar Supporter - Helped forge New Lunar Republic's freedom in the face of the Solar Empire's oppressive tyrannical regime (April Fools 2023).
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Dark Chaos Overlord
Hello. Some sites let you have multiple logins for the same user across multiple devices, sessions, tabs, etc.
 
However, Derpibooru doesn’t seem to have this functionality - that is, when I login on another device, my session expires on another device.
 
Is this intended to be part of the site-design for a security perspective, or some other reason?
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