As far as I understand the situation, RB will be in charge of everything on the track, and everything involved in the teams coming to the track to race . This will include levelling the playing field in terms of finances available to the teams as well as the technical regulations and sporting code.
Others will be responsible for the commercial aspects of the business - i.e. television rights, race sponsorship, trackside advertising, new tracks etc.)
So I think that RB will be able to address the inequality amongst the teams finances and level the playing field slightly.