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The event, which saw Paul move 3-0 professionally after knocking Askren out in the first round, reportedly drew over 1 million pay-per view buys.
But Lewis, a three-time world heavyweight champion and two-time lineal champion, was not impressed by what he saw.
Taking to Twitter, the 55-year-old reacted strongly to news that Triller, who broadcasted the bout, have filed a $100 million lawsuit against illegal streamers.
And in further tweets, 'The Lion', went in on Paul for "pretending" to be a professional boxer.
Paul is yet to fight a bonafide professional boxer, having faced YouTuber AnEsonGib, former NBA player Nate Robinson and now Askren, an MMA fighter but one with a background in wrestling as opposed to striking.
Both he and Tommy Fury, brother of WBC world heavyweight champion Tyson, have been going back and forth ahead of a potential meeting in the squared circle.
Lewis, meanwhile, is set to rematch former rival Mike Tyson in an exhibition fight in September.
'Iron' Mike recently told reporters as much, while Lewis gave a promising update while providing analysis on Fox Sports for Andy Ruiz Jr vs Chris Arreola on Saturday night.
"Not yet, but soon - maybe," Lewis said.
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