I have used cryptocurrency to buy steem monsters card and Steem silver rounds. You can also use bitcoin to buy other cryptocurrency silver rounds from Gold Eagle Coins. Crypto kitties were purchased with Ethereum. Then of course there was the famous pizza purchase with bitcoin and people that have bought houses and cars with bitcoin. I also think the Real Debrid service you can use with your kodi app on your Amazon Fire Sticks accept Bitcoin too.I'm sure there are so many more things like this out there that we don't even know about yet.