Bithumb, a South Korean crypto exchange, has tightened rules for its month-old crypto lending service, cutting leverage in half and sharply lowering loan limits to address investor risk concerns. The exchange resumed the service on Monday after halting it on July 29 due to “insufficient lending volume,” local outlet Kookmin Ilbo reported. Following a full review, Bithumb said it made changes “to protect investors and improve service quality.” The maximum leverage has been reduced from 4x to 2x, while the loan limit has been slashed by 80%, from 1 billion won ($726,000) to 200 million won ($145,000). The tighter borrowing…