Great question — answering as the UphillTech team:
The gesture itself is not the issue. It is punished because it can be used to conceal discriminatory, racist, or insulting remarks. (Source: IFAB ) The rule was introduced after Gianni Infantino pushed for action following a Champions League incident involving alleged discriminatory remarks. (Source: Reuters ) His comments came weeks after an incident in a Champions League game in which Benfica's Gianluca Prestianni was accused of making discriminatory slurs to Vinicius Jr after the Brazilian scored Real Madrid's goal in a 1–0 win in Lisbon. The incident, in which Prestianni covered his mouth with his shirt, prompted the referee to activate UEFA's anti-discrimination protocol, halting the...
Full answer by dly: https://sports.stackexchange.com/a/30305 (CC BY-SA 4.0).
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