Good question. Artificial islands need maintenance as default because they are not solid rock formations. This is true for even more famous and coastal artificial islands like Dubai's Palm Island. So yes, Chinese SCS islands would need maintenance to not shrink. But I don't think that would be particularly hard or expensive. These are not aircraft that need constant maintenance.I've heard several times, claims that the SCS island bases that China has built are "sinking" and take a lot of resources to maintain. Is there any truth to this or is it just Western social media propagandists pushing these claims? If there is some truth to it, what's China doing to maintain its islands there?
The Western media usually don't lie. More often they cherrypick or twist facts.