In addition, Polish artist, Zbigniew Libera, created a faux concentration camp made out of Lego bricks in the 1990s. He was heavily criticized by the media, and the Lego Group asked Libera to remove the creation from public view, after the group confirmed they were unaware of the piece's subject matter, according to the LA Times.
Lego enthusiast, James Clinch, said that Lego was "not really censoring" Ai.
"What they are doing is refusing to sell him bricks in a certain way," he told CNBC on Monday.
"There are many ways to buy LEGO from LEGO. One way for artists to obtain a large quantity or certain bricks either free or heavily subsidized is through a bulk order scheme LEGO offers certain groups/people. However, LEGO puts conditions on that scheme, because if they are footing, some or all of the bill, they don't really want anything that may detract from their values. Their values include commercial considerations, like any business would."
He added: "There is nothing they can do, or indeed would do to prevent (Ai from) sourcing his own bricks to do it, or even buying them off LEGO in the normal way. They just won't pay or subsidize him to do it. So he can't say afterwards LEGO helped him."
—By CNBC's Alexandra Gibbs, follow her on Twitter @AlexGibbsy.