They are flickering very fast. Persistence of vision smooths this out so your brain perceives a steady light. With the camera it is capturing some frames with the lights on, others off, due to a frequency mismatch, so it looks like they flicker.

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This also happens on bus, trains and underground boards. 8n picture we can't see number, and it flickers lol

Yes, lots of electronics and modern magic uses this feature of our vision! Movies are my favorite, just a bunch of quickly flickering still images 📽️