Teespring, a company that allowed users to create and sell customized merchandise, went from a promising startup to a failed business.The company faced financial difficulties and eventually had to restructure and sell to Amaze in 2022.Several key mistakes contributed to Teespring's downfall, including a lack of proper financial management and strategic missteps.Despite its failure, many former Teespring employees have gone on to build successful ventures, showcasing the importance of learning from mistakes.