The next issue I see is that file isn't executable on its own. You need to make it like you did in the cronsubprocess.Popen("/home/roguitar/public_html/chat/server/websocket_server.php")
subprocess.Popen("/usr/local/bin/ea-php72 /home/roguitar/public_html/chat/server/websocket_server.php")
I've tried this, too and nothing has happened.