@scully tchncs instances are usually open for public and no commercial service. users can and do donate for their funding. when you've clicked on that link, it took you to the pixelfed instance of tchncs.de. will think about if/how to make this more clear.
i however also host for clients, but not under the tchncs domain. but milan-ihl.de (currently german only)
Consider this a friendly, local pub. Make yourself at home, bring your friends, have a good time! Meet new people, have a laugh, enjoy the ambience, and the Oxford commas.