Privacy is a necessary feature in my opinion, but why hasn't Monero become a main coin?
Monero isn't as popular as Bitcoin or other big cryptocurrencies for a few reasons:
Not Well Known: Many people haven't heard of Monero because it's not as widely talked about or advertised.
Privacy Concerns: Monero's focus on privacy makes some regulators worried it could be used for illegal activities. This has made it harder for Monero to be accepted by big companies or banks.
Not on All Exchanges: Some cryptocurrency exchanges don't list Monero because of its privacy features, which can make it harder for people to buy and sell.
Complex Transactions: Using Monero can be more complicated than other cryptocurrencies because of its privacy features, which might put off some users.
Competition with Established Cryptocurrencies: Bitcoin and other big cryptocurrencies have been around longer and are more widely used, making it harder for Monero to compete.
Despite these challenges, Monero still has a loyal following and is used in situations where people really care about privacy. As more people become aware of privacy issues and rules change, Monero might become more popular in the future.