Those two distinct major private markets are inside platforms that compete with each other, so it's not clear what a monopoly means in that case. That's what everyone is trying to figure out.
A judge can't simply mandate a private tax rate and probably wouldn't want to anyway. Antitrust judgments typically try to remedy root causes limiting competition so the market can work out the rest, rather than try to guess some arbitrary "fair" rate that wouldn't be constant anyway.
A judge can't simply mandate a private tax rate and probably wouldn't want to anyway. Antitrust judgments typically try to remedy root causes limiting competition so the market can work out the rest, rather than try to guess some arbitrary "fair" rate that wouldn't be constant anyway.