It sounds like bullshit, but there's actually some truth to it: when providers of legal services with sketchy uses (I'm talking things like usenet searching, seedboxes, VPNs, scan4you, etc) lose access to PayPal they generally add Bitcoin as at least an option.
It's harder to obtain currency in some of the sketchier webwallets (things like PerfectMoney, WebMoney, etc) and they've been largely replaced with Bitcoin.
Likely because with Bitcoin you don't have to risk a government raid or an allout scam because the payment provider is sketchy (look into Liberty Reserve and Fethard Finance which used to be popular for this purpose).
