Answer: Free rider
A free rider problem occurs when those who do not join or work for the benefit of a group still benefit from that group's activity.
Explanation:
A free rider problem is known to be a type of problem which occur or happen when individuals in a group benefit from what they do not work or pay for. For example: provision of public goods by the government. Some citizens benefit from public goods such as good road, good sewage system and so on and they did not pay for taxes.