Many other countries, such as Italy, also chose to use the comma to mark the decimal units position. It has been made standard by the ISO for international blueprints.
In Italian, you use a full stop, not a comma, to separate thousands and millions in figures. Use a comma instead of a decimal point to show decimals in Italian.
Fortunately, Warzone (in every capacity) is totally free to play across PlayStation, Xbox, and PC platforms it's also a crossplay title, which has served to unite cross-platform players.