Simple - it may be called a "currency" but really it acts more like a stock. - There are limited ways to convert the bitcoin to USD, much like there are limite

Simple - it may be called a "currency" but really it acts more like a stock. - There are limited ways to convert the bitcoin to USD, much like there are limited ways (brokers) to move money in/out of stocks. - The exchange/price compared to USD fluctuates wildly. It is not stable like USD - it is more like a volatile stock. BTC was worth $18k on Dec 1 2020 and has gone as high as $63k since then and is now around $32k USD per 1 BTC. In my opinion, the major limitations to it becoming a stable, usable currency is the volatility and ease of use. You can have all the anonymity and hack proof tech you want but until its easy to use and stable, it won't be adopted widely. Any effort to make it easy to use will likely make it lose the anonymity part. For example if I can now pay at any POS terminal using an app on a phone, there goes anonymity.