Never heard of mini tokens before today. Even tried reading the doc line @Byakuga posted but still couldn't understand what will be the main use case for BEP-8. All I could they will be used my small projects but why use mini and not the BEP2?
Both BEP2 and BEP8 runs on binance chain, how is this hard to understand? There is more than just ERC20 on ethereum blockchain, do you know that? We have ERC 721 too and few others
If you read OP´s post correctly you will find out that he is asking what is the use case of the token. He is not asking about smart-contract (token) standards like you mentioned ERC-20, ERC-1155 or ERC 721.
You can read information about BEP8 tokens on GitHub:
https://github.com/binance-chain/BEPs/blob/master/BEP8.md