In what world do you think the ACCC, which only really has jurisdiction over Australia, should fine Uber some large portion of their worldwide revenue of $6B for misleading messaging about cancellations?
You can't do credible enforcement, if your primary goal is ensuring the company continues to grace you with their presence
Punishments need to be proportionate. Executing people for stealing hub caps may well reduce the incidence of that but that doesn't make it OK.
Misleading cancellation messaging just isn't that big of a deal. I really wish people would focus on the severity of what happened rather than just saying "it's not enough" just because they seemingly hate Uber.
People's personal dislike of a company or person is not a basis for determining a punishment.
The US also believes in punitive damages, i.e. "We fine you $1000 for what you did, and then add $1000,000,00 because you don't really care about $1000"