It isn't something new, it is a strongly specified, highly compatible implementation of Markdown. As seen in "common" use on large websites. And any implementation that passes the current spec tests can also brand itself with CommonMark or "Markdown compatible".
Very similar here in Japan (Both Tokyo and Kyoto). The price for a glass of soda usually starts around 500 JPY (about $5 US). 100 JPY on the street in a vending machine and 150 JPY from inside of a train station :)
Have you looked at number of comments instead of number of submissions? That would seem to be a better estimator of user growth.
Honestly, I don't think that estimating number of submissions is a very good metric for the growth of Reddit (or Hackernews). If you want some proxy for its influence, you care about readership more than anything else. This thread  on Reddit (and the references therein) shows that 50% of Reddit activity comes from users that aren't even logged in. So even if you were just able to measure logged in users (which would still be a far greater number than submissions), you would still only estimate half the influence.
For those who had a hard time finding the official information, I will repost it here:
Just a quick update on this: our Bitpay integration is feature-complete and can be added to your store now.
Due to the fact that it's a very new feature and not something we're ready to roll out to all stores just yet,
you will need to contact me to have it enabled, and I may want to follow up with you for your feedback once
you've been using it for a while, but it works. When active, Bitpay will appear as a credit card processor
in the Checkout page of your shop admin - enter your access key and you'll be all set to go.
One caveat: at this time, Bitpay functions in the same way as the other credit card processors on Shopify,
meaning that you can't use Bitpay in conjunction with Authorize.net, Stripe, or other credit card processors.
PayPal Express Checkout can be used as a secondary option with Bitpay in the same way it can be used with all
To activate, email me your shop URL at firstname.lastname@example.org and I'll do my best to get everyone up and running promptly!
One caveat: at this time, Bitpay functions in the same way
as the other credit card processors on Shopify,
meaning that you can't use Bitpay in conjunction with
Authorize.net, Stripe, or other credit card processors.
This is so half-assed, and frankly sort of typical in terms of the strange limitations that Shopify saddles you with (similar to how it took them 5 years to fix their database so you could modify a shipping address as a merchant). Sure, it would be fun to have a button that allows a customer to pay with bitcoin if they want to or are able to, but how many merchants would forgo credit card processing in favor of bitcoin? This "feature" is link-bait, and nothing more at this time.