Because when I hear the word "techies" I immediately think of predominantly white people in their 20s and early 30s with unusual personal style, titles like"Widgeteer" or "Revenue Program Manager". The photos of the subjects often staring into the distance at a promised utopian future also doesn't scream "serious" to me.

If I look around my office in the heart of the Midwest US I see about 20% Indian faces. There's about 20% women too, nearly all in their 40s (likely because of local women-in-STEM efforts here in the '80s and '90s).

Mousing over the images gave no indication what lay behind, it could have just been a larger image. The above the fold info didn't really seem all that different from a social media profile intro.

I had to read the "about" page as the site's purpose isn't readily apparent.

I see more diversity at uifaces.com or randomuser.me. Granted, that's likely because the photos at the OP are likely done by a professional and look similar.

I'm happy this exists (as previously stated); it didn't really grab me as a serious effort without having to put in effort to go into a profile and scroll well below the fold. Maybe being exposed to uifaces or randomuser and the proximity to April 1 (and the first link I clicked having an April 1 interview date) colored my thinking.