arbitrary and anecdotal don't mean that something didn't happen or even that it didn't happen a lot.
arbitrary means, and was used here to mean, random and unrelated to the topic at hand.
ar·bi·trar·y
/ˈärbəˌtrerē/
adjective
based on random choice or personal whim, rather than any reason or system.
"his mealtimes were entirely arbitrary"
synonyms: capricious, whimsical, random, chance, erratic, unpredictable, inconsistent, wild, hit-or-miss, haphazard, casual
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