Data is the key for Zoominfo. But these are gathered through hand-featured engineering and heuristics. Therefore, sometimes they are not accurate. For example, there will be an article saying that company X has Y number of employees, which are from the official sources. But ZoomInfo database would say that this number larger than 4-5 times than the actual number. The fact about human data is they always change as times passes. e.g. when they move to another company. Keeping up with this and detecting false positives are a challenge for this company.