On the second pic, the one that is smaller where there are people climbing on it. I think it looks like a coconut tree? But maybe it was called a bamboo on your country. That's true that it can produce a wine. That was the livelihood of the people on our place. It's tree has a lot of use cases other than extracting a wine on it.

You can also make a broomstick out of it and the wood can also be use to build a house and furniture but of course it works great as a firewood. It can last longer than a normal/real bamboo wood because it's more thicker. Looking for alternatives is fine but they shouldn't abused it because trees are also important.