They don’t. They rely entirely on donations (and sponsorship donations). It also mean, they have less resources to maintain and develop their software, ESPECIALLY Conqueror since it’s not as much well-maintained compared to other parts of the KDE software suite. Plus, Firefox do maintain their own web-engine, while KDE just use the WebKit one, so even more reasons that Firefox can’t substain with the resources KDE currently has.
Well, on my ESTA, they said the social medias disclosure is optional. Just a tool to help you confirm your intents visiting the US (or to be withheld against you as well) https://esta.cbp.dhs.gov/faq?lang=en&focusedTopic=Privacy and Security&answerToDisplay=How will CBP use my social media information collected through the additional question that was added to the ESTA application in December 2016%3F