Recently used devices: meaning if empty

As an admin, I’m regularly checking new users with low read time (1min or less; could be spammers).

Today I have seen the Recently Used Devices empty:
grafik

Does this tell me as an admin anything?
Normally I see at least one entry there, and seeing it empty catches my attention.
Are there reasons imaginable other than “user clicked on log out all” that can lead to an empty Recently Used Devices list?

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