There are people who are afraid to use bitcoins because they think that it can be only use in illegal activities because of its anonymity.
No . its not anonymity on why people refrain to use bitcoin but its about the appearance . i have talk to some people online and i introduce bitcoin to them . they said that they mistaken bitcoin as a scam because it is only a virtual currency and the name bitcoin is not really well known aside from this forum .
What is the benefit of people to doing illegal use of Monero?
They cant be traced by the authorities because monero is fully anonymous when compare to bitcoin but bitcoin can also be fully anonymous if you wil mix it using a mixing service such as bitblender .