I clicked on their profile to check and saw "Join us for AI Startup School this June 16-17 in San Francisco!" and I thought this was spam but it's actually part

I clicked on their profile to check and saw "Join us for AI Startup School this June 16-17 in San Francisco!" and I thought this was spam but it's actually part of the footer of Hacker News. Hovering over the link, the URL reads "ai-sus".