Because Rowling is said to be anti-trans: Quidditch is being renamed
The chairman of the board of the Freiburg club "Bowtruckles", Max Benzinger, told the online portal Fudder.de: "If Rowling does not recognize the existence of trans people, then we find it bad. We can't stand behind that." He is happy "if we can rename the sport to 'quadball'". This allows one to distance oneself from Rowling's statements.
Many genders in one team
The avowed leftist Rowling has been attacked by trans activists for years because she insists that only women can menstruate and that there are two genders.
In real-life Quidditch in Germany, borrowed from the Harry Potter books, women, men and allegedly non-binary people play in a team. Only a maximum of three members of one gender may appear in the six-person team. “Every gender is recognized. The Quidditch community is very diverse and has a lot of queer members,” says Benzinger.
Source: Junge Freiheit