I get the feeling about 90% of those laptops belong to either cyber security folks or rust developers. Just a gut feeling.
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They even showed us this cheesy video showing.
1. A woman chatting up a developer based on their stickers on the laptop they saw earlier. 2. Someone targeting the laptop for theft because of the stickers.
People still do it, but I've only seen it on the junior people trying to express who they are.