Exam 312-85 topic 1 question 34 discussion

Sam works as an analyst in an organization named InfoTech Security. He was asked to collect information from various threat intelligence sources. In meeting the deadline, he forgot to verify the threat intelligence sources and used data from an open-source data provider, who offered it at a very low cost. Through it was beneficial at the initial stage but relying on such data providers can produce unreliable data and noise putting the organization network into risk.
What mistake Sam did that led to this situation?