Under Armour are very much a global company..
I know it's not a like for like comparison but rugby union stars and clubs in the NH have larger social media followings than NRL players. Walsh has the most with 500k+ followers, they even claim SBW as the most followed with 1m+ and you can guess why he has so many. Ntamack, Dupont, Kolisi, Quade, Farrell all have more followers than any league player.
Any side deals Mark gets offered here can definitely be matched up north and then some. SOO had 4m watchers, the T14 final had 5m watchers and that's just their domestic comp.