Duty of care: Board members are expected to actively participate in organizational planning and decision-making and to make sound and informed judgments.
Duty of loyalty: When acting on behalf of the organization, board members must put the interests of the nonprofit before any personal or professional concerns and avoid potential conflicts of interest.
Duty of obedience: Board members must ensure that the organization complies with all applicable federal, state, and local laws and regulations, and that it remains committed to its established mission.
In this particular case, the "duty of obedience" is a real concern given the new board memeber's history of violating anti-trust laws through non-poaching policies. For example, while those tech companies involved in the non-compete scandle had enough cash on hand to pay for the settlement, the impact to Wikipedia could have been much more substantial.