dkfmn

I second your industry suspicions. There are probably also some niche subscription businesses out there like CandyJapan (http://www.candyjapan.com/candy-japan-crosses-10000-mrr) but at larger scale.

Appreciate the detail, that is one of the companies I didn't know well.

Seems pretty misleading to call these one-person startups. Maybe PlentyOfFish should qualify because it was run by one person for years with significant revenues and profits, and there may be a good case for DuckDuckGo.

I can't say with absolute certainty about all the rest but many were solo founders who quickly attracted a team.