Arbitrage in cryptocurrency trading due to typos!
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It's a real shame that GitHub doesn't run CI against PRs from new contributors any more: https://github.blog/2021-04-22-github-actions-update-helping-maintainers-combat-bad-actors/
Preventing arbitrary cryptocurrency mining code is incredibly hard though. It's increasingly common: https://layerci.com/blog/crypto-miners-are-killing-free-ci/
Firefox 69 is shipping with protection from cryptocurrency mining running without the user's knowledge: https://venturebeat.com/2019/04/09/firefox-will-now-let-you-block-fingerprint-tracking-and-cryptojacking/
I know CI services like Travis have to worry about this, but I wouldn't have thought JS mining would be anywhere near worthwhile.

