Coinbase's recent data breach exposed 69,461 customers, with stolen data used in social engineering attacks to steal millions.Almost 1% of Coinbase's customer base was affected, with leaked data including sensitive information like social security numbers.The breach involved insider wrongdoing and attempted extortion of $20 million in Bitcoin from Coinbase.Customers fear further crimes like identity theft and targeted asset theft after the breach.Coinbase CEO Brian Armstrong criticized KYC compliance measures, calling them ineffective against crime.There are concerns that KYC requirements might be unconstitutional and burdensome for companies like Coinbase.The timing of Coinbase's disclosure of the breach, just before user agreement changes limiting class action lawsuits, drew criticism.Five class action lawsuits have been initiated against Coinbase since the breach, with allegations of delayed disclosure.Coinbase claims the changes to the user agreement were unrelated to the breach and aimed at consistency in user terms.The regulatory backlash against Coinbase highlights the ongoing challenges and controversies within the cryptocurrency industry.