Yes, I can say that based upon the available evidence. I have studied enough about monopolies that I feel completely comfortable with saying Steam is a monopoly. I totally get you are in denial. That is okay.

I find it strange you would bring prostitution into this as an example. But, if you knew I accepted money for sex like we know Steam has engaged in anti competitive practice while controlling the majority of the market then I guess it would be safe to call me one. Cheers!