Why don't you want anyone to know what you're buying?
Wait a minute --- I already know you're buying Monero, so maybe you DO want people to know what you're buying?
The people on the dark-web give us all a very bad name and it gives the government more reason to regulate the crypto industry. Monero serve a valid purpose in the market (unlike most of these shit-coins) and keeps them in the dark, BUT......
The only legit reason to want to stay hidden is so you're not spammed by advertising-whores - Everything else is illegal.