I think you have to look at history, to some extent.
Super League, World Series Cricket and even the original pro rugby concept of involving Kearns et al all had serious repercusions for their participants in relation to the traditional governing bodies.
Dont forget that blokes like Ken Wright were not even allowed to run the water for colts in the amateru era because they had accepted money from the other rugby code.
Its debatable just how far the ARU has moved from those amateur days!
While the ARU seem to have brought about the demise of the Force it is doubtful they would feel any moral obligation to support the Force in a different competition.
Its interesting to speculate what World Rugby's position might be: we've never been top of the xmas card list so maybe they would not lean on Asian national unions to steer clear - but in the end their view is probably that complete control of the game is desirable and is best achieve by defending the ARU through threats to affiliation to any foreign union that embarks on participation in Twiggy Ball.
All other prior rebel leagues have had a media backer looking for content - that's not twiggy: maybe his fellow West Australian, K. Stokes cold be enticed, but 7 probably isn't looking to have a rugby war.
God forbid that I should ever promote anything of Fitzsimons but this provides some background to how we got to pro rugby:
https://www.goodreads.com/book/show/6184605-the-rugby-war