The adoption of wild animals does not mean that you are actually going to take that animals home with you. It is dangerous and is not something that is recommended. What such kind of adoption means is that you will become the guardian of the animal which will continue living at the zoo.
The reason why it is so significant is that the animal will have more people taking care of them. Besides, you will also be able to help provide that animal with food, visit and play with the animal in case it is possible as well as make sure that the animal gets everything they need. Surely, helping financially is of great importance in this respect as well.
The more people are involved in the process of adopting wild animals, the more unique species will be able to survive. You are probably aware of the fact that lots of species of wild animals are at the brink of extinction nowadays. Well, getting proper care and sufficient funding will help prolong the lives of those animals and make sure that those species do not become extinct.