But, in a statement, Fury's promoter Mick Hennessy trumpeted YouTube's 1.5 billion global audience.
If nothing else, broadcasting a title fight via such a large online platform only strengthens the evolution of sporting viewership.
"The heavyweight championship of the world is still the biggest prize in sport and can capture the imagination of the public like no other sport," Hennessy said. "For Fury v Parker, we decided to make this event innovative, forward thinking and really push out the boundaries.
"We've been talking to YouTube for months about bringing boxing to a wider audience through their platform, and are delighted to have found a way to achieve this.
"The way TV viewing is consumed has altered rapidly in the last few years and we wanted to be at the forefront of that change in presenting this fight. As a company, Hennessy Sports, is proud to be playing such a pivotal role in transforming the way in which live boxing content is televised. This is the future of boxing."
Fury said: "I'm thrilled and proud to be part of an historic event that will be remembered in years to come as a defining moment in the sport.
"Parker is the biggest challenge of my life and he will bring the very best out of me, but I aim to deliver a knockout performance for YouTube viewers who will see me lift the WBO world title at the end of the fight."
Peter Fury, father and trainer of Hughie, added: "I'm thrilled that the fight will be shown live on YouTube in an innovative move that will bring a whole new audience to our sport. I'm proud that my son will be challenging for the WBO heavyweight championship of the world in his home city in what will be a great fight that I believe will see Hughie crowned world champion live in front of YouTube viewers."