is bitcoin largely used on the deep web because of the anonymity it offers and is it the only payment method available if your shopping on deep web or there are some other payment method aside from bitcoin and how big bitcoin is on deep web?
It can still be used in deep web because Bitcoin but using it will not give you fully anonymity because it can be traced, just like what happened to Ross Ulbricht the owner of silkroad, he got traced by selling drugs and accepting Bitcoin as payment and it happened several times. At this point there are lots of cryptocurrencies that was created to provide fully anonymity to all of its users like Monero, Dash and more, and even I don't go to deep web, I'm sure that they are now using this type of cryptocurrencies as an alternative to Bitcoin to avoid being traced by authorities. Possibly Bitcoin is still being used in deep web but if you are a smart drug seller why would you risk using it if there are lots of alternative that will make your transaction safer. So I think that Bitcoin is now more being used on a good transactions.