Being taught to use both hands is very common in sports.
https://www.youtube.com/watch?v=8U2xkHOTvvw - Ambidextrous Pitcher Pat Venditte. He played college baseball at Creighton University. He's now in the New York Yankees farm system.
Ichiro Suzuki, naturally right handed, was taught to hit left handed by his father. To shorten the distance between him and first base.
Not to mention all the switch hitters in baseball.
Being ambidextrous is also important in basketball. For dribbling, layups, and dunks.