Not bitcoin alone. As a whole and be the number one threat to cryptocurrency is the government (regulation). Greed from government officials and lobbying by the big businessman. But if we were to talk about bitcoin as the top crypto coin as of now there's none. It's been a while and time passes but bitcoin has constantly been set aside by mainstream acceptance.

Unfortunately, as we come and go in this forum will remain unchanged the sentiments and uncertainties as a bitcoin user from the outside perception of ordinary citizens. Bitcoin is a scam. me (laughing!!).