But the site is for software managing... CCTV solutions.
I didn't know what NVR meant either but it seems reasonable for Frigate to assume 90% of the people coming across their site would be given the context.
You seem really worked up over some perceived slight by people you'll never meet running some random website committed against you, personally, with intent.
You think they have contempt for you? "The feeling or attitude of regarding someone as inferior or worthless." "The state of being despised." That's a bit of a stretch.
There's nothing wrong with expecting people to do ~10 seconds of research to find out what an acronym means. It look me less time to open a tab, type "nvr video", wait for the HTTP request, scan the page, and close the tab than it did for me to write the last sentence of this comment.
I'm not sure why you're assuming most people ever requested a quote or looked up CCTV solutions. I sure haven't.