Nextbike, a city bike rental operator, was penalized by the President of the Office of Competition and Consumer Protection (UOKiK) for implementing abusive clauses in its regulations. The company unlawfully modified its terms and conditions, leading to unjustified financial burdens on consumers. This case highlights the importance of complying with consumer protection laws and avoiding unfair practices in the rental services sector. The penalty serves as a warning to other businesses to review their terms and conditions to ensure compliance with regulations and to refrain from imposing unjustified charges on consumers.