Thanks for your long reply, but you have misunderstood things a bit.
We are not suggesting that the SPS contribution is the sum total of all funds going to fight Facebook etc. It is part of a mix of funds from lots of sources.
I am a very experienced lawyer who has twice won cases in the High Court of Australia against an opponent far bigger than Facebook, Google & Twitter put together! I know what league I am playing in and have been there before many times.
The cost of legal cases for most people is mainly from paying lawyers. But when you are an experienced lawyer like me, you can do most of the legal work yourself, and thus it can cost much, much less. I've done this before a number of times.
Unlike the US, where anti-trust law is weak, and the EU, where its all done by government, Australia allows private anti-trust class actions and has strong competition law. You are basing your thoughts on completely different legal regimes from the one we are bringing the class action in.
Why don't you file the suit already?