I've seen some suggestion that they spend more on average than the average consumer. But I suspect they'd spend even more. And getting some content free and paying for others has discretionary effects.
There is more free content made every day online than one person could consume in their entire life. Even when 99% of it is garbage, that 1% is still more than you can fill your time with.
I read a few dozen webcomics, most of which have patreons, but I don't get ads on my rss feeds for them, and there are thousands of webcomics. And artists. And musicians. There are dozens of websites for hobbyist, amateur, and even freelance professional games, animations, etc.
There is a fraction of pirates that will pay for content they would otherwise torrent because they want that content. But that doesn't imply they are more likely to buy entertainment. A portion probably just turn to free legal sources.
Buying bitcoins, and then "laundering" the coins is relatively trivial, you just run them through a few of the more anonymity-inclined altcoins.
Using those bitcoins to get torrent-friendly hosting? Hit up Infium in Ukraine, they won't mind a few threatening abuse emails. https://infiumhost.com/
Domains you can get from Njalla, Namecheap and a plethora of Chinese registrars who won't even read English abuse emails.
Want to earn money? It gets slightly trickier. There's a few solutions here. If you get lucky, you might find a well paying VPN affiliate program that'll pay you in bitcoin. But the more common solution is setting up a shell company and bank accounts in a friendly jurisdiction to accept payments from different advertising companies until you find one that won't kick you off.
I suppose it might even be possible (probably not legal however) to do that in an anonymous manner, you can register businesses online with bitcoin (or if you need a mastercard, you can get an anonymous one from https://advcash.com right now!) and opening bank accounts over the internet isn't exactly impossible either. Later you'd just wire all that money to a bitcoin exchange.
For many of these sites just their continued existence is a success - however many years it ends up being.