Strange fruit was heavily cut down in China, becoming endangered, yet in Southeast Asia it runs rampant and nobody eats it

In our country, there are many kinds of fruit, and some of them are even exported to other countries. Of course, our country also imports fruit from other countries, so people in our country can eat fruits of all kinds of flavors. But there is one fruit that, because it was scarce, was heavily cut down by people in our country, leading to it becoming endangered. It has now become a nationally protected plant, and cutting it down is no longer allowed. As a result, few people know about this fruit.
Its name is nipa palm fruit (water coconut). This fruit grows in water, looks very strange, and few people recognize it. It exists only in a small part of Hainan Province in our country; no other region has nipa palm fruit. Precisely because nipa palm fruit is so scarce in China, its price is naturally very high. In our country, basically only the very wealthy can eat nipa palm fruit; ordinary people simply cannot afford this fruit. This nipa palm plant is especially scarce in our country, and together with people's past overcutting and destruction, it has now been listed by our country as a nationally protected plant, and eating it is no longer allowed.
But in Vietnam, the price of nipa palm fruit is worlds apart from that in China. In Vietnam this nipa palm fruit grows everywhere, and because Vietnam has so many tropical fruits, Vietnamese people do not have any particular fondness for nipa palm fruit either. Locals do not eat it; they all sell it to tourists, so nipa palm fruit in Vietnam really does run rampant. If you ever get the chance to go to Vietnam, you will find that nipa palm fruit is often sold on the streets there, and the price is very cheap. Some netizens who love eating nipa palm fruit might say, let me go to Vietnam, not for anything else, just to eat nipa palm fruit to my heart's content, and it will not cost much. Vietnamese people also use nipa palm fruit to make some snacks, sold on the streets of Vietnam; they are crisp and fresh, with a distinctive flavor.
I really never expected that nipa palm fruit, which is so expensive in our country, could be so cheap in Vietnam. It really is true that different regions can produce different fruits. For local people in Vietnam, nipa palm fruit has other uses too: the leaves can be used to make cigarettes, they can also be used to weave handicrafts, and so on; the flowers can be used to make seasoning, and sugar can also be extracted from the flesh of the nipa palm fruit, and so on. There are many things about it that we do not know.
Unfortunately, there are too few places in our country suitable for nipa palm fruit to grow, and it cannot be introduced and planted on a large scale, otherwise this fruit could be popularized in our country.