I agree that piracy and cheats should be part of the discussion.
But that's about it
GaaS automatically elimitates neither piracy nor cheating.
Plus, those two arguments are irrelevant when talking about 'de-GaaSing' a game post-mortem.
And why would any accept of unethical or illegal behaviour just because it makes life easier for a company?
Cheats can only be challenged effectively by validating the player's actions. There were cheats in WoW.
Performing the simulation on a trusted platform, however, would help a lot.
But most simulations are to expensive to perform in one place. Scaling is also free when the player provides the computation power. And there's always be the issue of lag.
I'm interested to see how cheating develops with Stadia et al.
Ignoring whether GaaS is effective againt piracy, the right to backup copies and preservation generally trumps copyright protection - at least in Europe.
Let me know what you think.