said by arpawocky:OpenCNAM/Everyone411/EveryoneAPI being one of the third-party databases that sometimes is missing the info, or worse, has outright wrong info.
But don't single THEM out.

There are hundreds, if not thousands of 3rd-party database operators, and as Trev said just above, it's a question of at what price-point they wish to offer their services, and how much they can afford to spend and still turn a modest profit.