Why wouldn't or shouldn't they market it? Coca-Cola Germany improvised a new soft drink during the war and called it Fanta, and later it was adopted by the parent company. It's not like they helped build the gas chambers or anything.

Well a soft drink developed to work around trade restrictions is pretty much unrelated to crimes against humanity. They even discontinued the line it once reunified corporately (now that the restrictions were gone) but demand remained so it was returned to production.

LOL, wow.

The Fanta drink originated as a cola substitute in Germany under a World War II trade embargo for Coca-Cola ingredients in 1940. . . . In February 2015, a 75th-anniversary version of Fanta was released in Germany. Packaged in glass bottles evoking the original design and with an authentic original wartime flavor . . . An associated television ad referenced the history of the drink and said the Coca-Cola company wanted to bring back "the feeling of the Good Old Times".

https://en.wikipedia.org/wiki/Fanta