The main thing is the level of plausible deniability. There are lots and lots of reasons why someone might see an ad for a rehab center on your screen. Perhap

The main thing is the level of plausible deniability. There are lots and lots of reasons why someone might see an ad for a rehab center on your screen. Perhaps a friend or relative has a drug problem and you're reading about it. Or the rehab center is advertising widely.