Binance US, the American arm of popular cryptocurrency exchange Binance, is currently not listing Shib. There are a variety of reasons for this, but the most likely explanation is that Binance US is not yet ready to list all of the coins that are available on the main Binance platform.
Shib is a relatively new coin, and it is not yet clear whether it will have long-term staying power. Binance US may be waiting to see how Shib performs over time before making a decision to list it.
Another possibility is that Binance US has not yet completed its review of Shib. Binance US has strict listing standards, and it may take some time for a new coin to go through the entire review process.
It is also possible that Binance US simply does not believe that Shib is a good fit for its platform at this time. There are hundreds of different cryptocurrencies out there, and Binance US has to be selective about which ones it lists.
At this point, it is not clear when or if Binance US will list Shib. However, given the popularity of the main Binance platform and the continued growth of the cryptocurrency market, it seems likely that Binance US will eventually list Shib.