If it’s not open source then it’s an advertisement not an esport
If someone goes to host a tournament and they can’t choose the patch or modify it then it’s not an even playing field between organizers. Think like 2 people go to host on consecutive weekends and there’s a patch between them now the person who hosted first has an unfair advantage in game quality as the players know how to play it
Also if the studio/publisher is hosting an event it’s just an advertisement