Because Michael Matt and Taylor Marshall are the biggest names right now in "Trad Inc."
Maybe throw in John Henry Westen of LifeSiteNews; they have a pretty big website.
But beyond that, I can't even list any others. I don't seek out or consume such "conservative Catholic" content. To be brutally honest, their information, insights, and opinions are far beneath me. I could 100% produce better myself.
So most of them, the small fry, are unknown nobodies. Like with any field, you have a few big names, and then a whole gaggle of nobodies attempting to make a name (and money!) for themselves and be relevant.