Looking for a German grey or black hat, who tells about his/her experiences

I am a journalist for the Y-Kollektiv, the largest German reportage format on YouTube. I find their site very interesting and hope for their help.
I am looking for Grey or Black Hats, with whom I can talk anonymously about their skills. In any case, I wanted to ask if you might know such people? Or could you mediate? Maybe you could help me look for such people in Darknet. There is for example the Marketplace where zero-day-exploits are offered. Maybe you can get in contact with the sellers there?

Thanks a lot and best regards,
Mirco Seekamp