Nodes can sometimes play a role on atops depending on how atops is structured.
Nodes can be involved in atops in different ways. Atops may require participants to run a node in order to be eligible for the airdrop. This could be because they wants to ensure that participants are contributing to the network in some way, or because they want to reward those who are actively supporting the project.
In other cases, nodes may be used to facilitate the distribution of the atoos itself. For example, a project may use nodes to verify that participants meet the criteria for the airdrop, or to distribute the tokens to participants once the airdrop has ended. This can help to ensure that the airdrop is distributed fairly and efficiently.