Thank you for your replies. Yes, they are not that "visible", that's why I was curious of any contributor experience of this agency. Like, what type of content do they accept, what type of content do they sell (and do they sell), what are contributor earnings, are there any hidden traps, etc.
A lot of agencies are after "lifestyle" - technically low quality photos of people representing minorities making weird faces and poses. I was hoping to find an agency that is NOT into that nonsense, but I guess that's impossible right now.