It means that you are self-sufficient from the start to the finish line and do not receive any assistance from third parties who are not part of the event, unless it is commercially available for each participant. However, for us, unsupported does not mean that participants are not allowed to help each other during the race, as for us this is part of the cycling culture in the sense of community. Everyone should be able to decide for themselves whether they want to help someone else or not.