Not much is mentioned, but let's talk about tiers of BTC, most people are buying the 'used' BTC the stuff that trades in exchange over&over, but criminal GOV's are paying 10X for the mined stuff that has no record, you buy it directly from the chinese mining firms and pay cash, no record of it ever being transferred, escrow keys are transferred to new owner, and multiple keys are required, but essentially clean PRISTINE bitcoins that are mined and never used in the blockchain have TREMENDOUS black market value, this keeps the price UP as most new blocks are sold to black-market high price 'investors', where GOV can never know owner, or most likely GOV is the owner.

Second tier is the shit ppl buy with their $100 cash/credit card, normal used bitcoins

The the third tier is the hot-shit that must be tumbled, and mixed in with the used. Say I crack a 1,000 BTC account, figure out its private keys using my favorite ALGO, and I transfer (sweep) those coins into a fresh random private-key/address, but then what? Well I can't cash out, cuz the owner of that $10Million USD is looking for his money back, so what do I do? Well U go to the black-market and you find a BUYER of 'hot-coin', perhaps you only get 20% on the dollar, but still good, new owner can take risk, if its in a jurisidction of friendly GOV, then they can 'launder' the hot btc, or tumble it with exchange coins,  a little guy can't really clean hot-coin, but like HSBC most real money laundering is done by BIG-BANKS, same with BTC, the exchanges and gov-banks can launder the hot BTC,

Just to think about "Not ALL BTC are equal", also note that your btc, may not be worth what you paid, for majority of here doesn't matter they don't BUY a block of 12.5 BTC and paycash on black market, but I think that many ppl are buying hot-coins that are resold to the suspicious exchange sites.