The lag would be enormous between galaxies, unless we invent quantum entanglement, in which case the lag is also irrelevant because you can teleport yourself.
Teleporting would still require energy and therefor money. Plus wearing pants. So I think the biggest problem is coming up with: A) A network protocol for quantum entaglement. B) porting the Zoom client to the Yapple N1 architecture, the most recent Alien Processing Unit from the company Yapple, named by the popular yapple fruit on the planet Mostly Sand. (Yes, they also named their planet after the material that was under their feet, which they regret after joining the United Planets) Yapple recently used 1.2% of the company’s cash reserves to buy up their only competitor’s architectual IP, their workforce, factories, land, workers, workers families, cities, countries, planets, solar systems and galaxies. So luckily for Zoom developers, there is only one port to be done.
Remember that for last 20 or so years we try to move to IPv6 first we have to finish that before we go any further :)
Quantum entanglement does not allow you to communicate information faster than c (though it does allow you to correlate behavior, in a way which the benefits of which can't be seen until after a light-speed delay)