Nextbike Poland, a major operator of city bike rental systems, was penalized by the President of the Polish Competition Authority for using abusive clauses in consumer contracts and making unauthorized changes to terms and conditions, resulting in consumers being unfairly charged additional fees. The company's actions violated consumer rights and distorted the balance of obligations in contracts. Nextbike Poland must pay a fine of over 791,000 PLN and inform consumers of the decision, allowing them to seek legal recourse. The case highlights the importance of clear and fair contract terms in maintaining a balanced relationship between businesses and consumers.