Are there any startups that are run by a single person (bootstrapped by solo founder with no employees) that generate revenues over $1M?
Markus Frind of PlentyofFish. Until recent years, he didn't have any employees and was generating well over $1M/year as a solo entrepreneur.
Some interviews with Markus that are an interesting read:
The biggest part of his success that I find interesting is not just him achieving it. It's how he's been able to sustain it over the years. That is just as hard to do.
There are lots of "super affiliates" in the affiliate marketing industry that also make over $1 million in affiliate commissions. Jeremy Schoemaker, John Chow, etc.