You can spit a bit of cola or orange juice on it and it'll false positive. Rumor says that children are all aware of it and using this strategy to ditch school.
https://montreal.ctvnews.ca/it-s-not-the-real-thing-youth-tr...
(Most children of schoolage I knew in germany, after long lockdowns, think like that. Poor children, they have it so bad, they even want to go to school again..)
Maybe insurance fraud? If you were somehow covered or wanted a refund on some travel. But again, I can't imagine a policy which explicitly covers COVID being beneficial for the underwriter.
"I'm sorry I can't join the family meal, I have tested positive"
My experience has been that you can at least get a day off depending on your organisation's policy or until you receive a negative result on a PCR confirmation test. Think perhaps about that business trip that you really don't want to make. I remember reading reports on schoolchildren coming up with chemical solutions (IIRC cola) to fake positive covid testing results in order to skip school. A slightly "techier" covid testing product like the one from the article might placate a more suspicious employer.