Does money earned from introducing people to a permissible technology company become unlawful if one of the beneficiaries of this company uses its product in an unlawful act without the knowledge of the introducer?

The money earned from referring to a company that provides a permissible (halal) service is lawful, and there is no sin upon you if some beneficiaries use its services for a prohibited purpose, unless you knew beforehand their intention to use it for the unlawful. In that case, it is not permissible to refer them to it, and the money would not be lawful for you.