A comment under your question seems to explain the reasoning:
I'm voting to close this question as off-topic because it's purely about tipping decisions, not about tipping culture. – Nean Der Thal 2 days ago
This seems sensible to me. The question is opinion-based. Some will say it's reasonable not to tip, others will disagree.
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- a question where every answer is going to be equally valid (eg 'What country in Europe should I visit?' (which would also be overly vague and broad))