You may have read recent reports that the U.S. Commodity Futures Trading Commission and Department of Justice have filed charges (announcements here and here) against the cryptocurrency exchange BitMEX and several people involved with the company. This includes Ben Delo, a major EA donor and a cofounder of BitMEX.
CEA, Effective Giving UK, and 80,000 Hours became aware of the charges yesterday, when the news was first reported. No findings have been made about these charges at this point. We will continue to watch how things unfold and learn more, and will continue to update the EA community.
Justifying potentially bad stuff with "the stakes of the work EA does" feels like a slippery slope and a bit fanatic. There should be principled reasons that holds true for all charities, the cost-benefit approach you use the second part of your comment is better. Related: this thread on whether it's okay to work in the Tobacco industry.