According to Muso, punters have been able to dodge BT Sport's £19.99 charge and find live video footage of the bout on bogus websites.
The figures are sure to rile the big broadcasters, with illegal streaming becoming a growing trend that undermines the likes of boxing broadcasters BT Sport, Sky Sports and ITV.
American broadcaster Showtime was charging £58.87 for the fight and will have lost millions from illegal streaming.
Over 133 streaming domains were available online and 80 live YouTube links were being beamed, according to researchers.
Muso chief exec Andy Chatterley said: "This fight was always going to draw in a massive audience, and it certainly did that.
Wilder shows ‘video proof’ Fury didn’t beat 10 count
DEONTAY WILDER has taken to Instagram to try to prove that Tyson Fury did not beat the count during the twelfth round of their fight.
Wilder, 33 and Fury, 30, fought to a controversial split decision draw on Saturday night, with the American holding on to his WBC heavyweight world title.
It seemed like Fury had boxed to another famous win on away soil, however, in the final round Wilder dropped the challenger with a heavy right hand, left-hook combination.
As Fury’s head and body crashed down, it seemed like The Bronze Bomber had pulled off a dramatic late win.
Until the Gypsy King astonishingly rose from the canvas – much to the disbelief of Wilder and boxing fans.
One fan said he'd proved Fury had beaten the count by just 0.1 second, however, Wilder disagrees and he posted a video on Instagram apparently showing the Gypsy King just failing to rise in time.
READ MORE ABOUT DEONTAY WILDER'S EXTRAORDINARY COUNT CLAIM
"In fact, our Muso Discover data shows that, globally, nearly 10 million viewers chose unlicensed channels to watch the bout.
"This is a huge audience that is, to all intents and purposes, being ignored.
"Data like this offers insights that could help bring fans back to legal content, but they need to be acknowledged first."
YouTube and Ripple were the most popular streaming sources in the UK, where more than 1m viewers found bootleg broadcasts on their computers.
Tyson Fury brilliantly got up off the deck twice to draw with Deontay Wilder, setting up a likely rematch.
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