Forbes doesn't have a Russian bias. It has a business model bias. In short, it milks its good name while paying a low per click rate.
This combination is very, very attractive to propaganda operations. People who see themselves as writers cannot make an actual living there, but writing for a publication their parents recognize feeds their ego.
This can work either overtly or more subtly. They can simply reward useful perspectives with clicks, or they can offer additional steady money work through other channels. Either way they have an entirely deniable useful idiot.