The S.E.C.’s actions indicate a push to require crypto businesses offering securities to follow the same rules as traditional stock and bond exchanges.
The S.E.C. said the world’s largest cryptocurrency exchange mixed “billions of dollars” in customer funds and secretly sent them to a separate company controlled by Binance’s founder, Changpeng Zhao.
A stock sell-off driven by a since-debunked picture underscored fears about how artificial intelligence could be used for nefarious purposes with big consequences.