Seems to me the implication of this statement is that like a lot of other organizations, some of these platforms are not only guilty of shoddy behavior in terms of human rights, but also been conduits for illegal and duplicitous operations on the dark side.

They are NOT just what they seem. There is the public face, which is ugly enough, but there is the illegal and black operations they have also been running or instrumental is executing:

Human trafficking

Drug trafficking

Political control (e.g. blackmail operations)

Money laundering

and so forth.

Haven't dug on this much, but its what I suspect.