Is this a joke about fiat currencies and their tendency to suddenly become valueless and cryptocurrencies tendency to suddenly become valueless by making a cross language pun connecting the owner of a new cryptocurrency and the name of a currency most famously known for a hyperinflation.
Papiermark (https://en.m.wikipedia.org/wiki/German_Papiermark) pre 1924 was the hyperinflated currency, then followed the stable Reichsmark and after World War II Deutsch Mark and East Deutsch Mark. Deutsch Mark remained until 2002 when the Euro got introduced. For Germans Mark is just a name for currency like Kronas (Sweden), Francs (France), Lira (Italy). Hyperinflation is too long ago to remember.
Germans use cash much more than the average Western European. The memory of hyperinflation and bank system collapse is one of the explanations why people prefer to store value in currency (often foreign currency) and not trust so much a bank or card issuer.
Also, in West Germany, the Deutsche Mark (1948-2002) is strongly associated with the post-war economic boom. It's still a common rhetoric among conservative populists to argue for a return to the good old times ^W Mark.
I don't think it is just a "common rhetoric", but rather a common mainstream truth that the change from the Mark to the Euro (which can be kept weaker) allows German companies to export cheaply while making people's salaries and savings worth less.
I think Hyperinflation fears are ingrained into EU policymakers DNA. They are so afraid to create demand in the macro economy via deficit spending because of the legacy of the Weimar Republic and what it led to. Looking at the WR case, they had to pay war reparations in hard currency not fiat. Because of this, you have Germany pushing for very dovish fiscal policy limits on Greece and the PIGS. And to make things worse, monetary policy, doesn't work even with negative interest rates.
Missed opportunity to call them "Marks", although maybe only German speakers will get the joke.