Swift hasn't. And probably won't in the future, thats the gist of it.
TM claimed (and I have no reason to not believe them) they got 5 billion requests when tickets went live. So you break up the monopoly and Swift can now sign with a different ticket seller next tour. Which other website will handle the 5 billion requests properly? Without hours of queues or random raffles? Fans are lucky the TM website didn't completely shut down for 2 days because of the traffic
As long as the tickets are sellable, as long as people will pay more for a ticket than a new car, people (even diehard fans) will resell