You have, like, two natural choices of contrasts to red: green and blue, maybe black/white. There may be more involved reasons why green is more globally common

You have, like, two natural choices of contrasts to red: green and blue, maybe black/white. There may be more involved reasons why green is more globally common as a second color choice than blue, but I don't think it's surprising that they use a green even without special cultural connotations.