I mean, it’s not like Zendesk is somehow hidden from the rest of the internet and we can’t find out what they do. You literally just have to type “zendesk.com” into your browser and read.
Just in case people don’t want to click on the link, here’s a quote from Zendesk’s front page:
So no, there’s no work outsourced to Zendesk, they build customer service software and companies like Funcom use that software.