What countries is Coinbase banned in?

Coinbase, as a global cryptocurrency exchange, operates in a complex regulatory landscape, with its availability varying across nations. So, may I inquire about the countries where Coinbase is banned? It's crucial to understand these restrictions as they can significantly impact the reach and usability of the platform. Moreover, such information is vital for investors and traders to make informed decisions about their cryptocurrency holdings and transactions. Could you please elaborate on this matter, highlighting the specific countries and, if possible, the reasons behind these bans?