What is an example of bad UX design?

Could you provide an example of poor user experience design in the realm of cryptocurrency and finance? I'm curious to understand how a platform or application might fail to cater to its users' needs, leading to frustration and potential loss of trust. Perhaps a scenario where navigation is overly complex, important information is hidden or unclear, or transactions are unnecessarily time-consuming and prone to errors. How might such issues impact the adoption and success of a cryptocurrency or financial service?