However, when you gave people a choice, saying, “If you want to get through the airport faster, submit your biometrics and you can get through faster”, lots of people made that choice. By providing choice it was accepted.
I would also say your own GC login service, the partner login service, also gave choice. You did not compel Canadians to use the bank account to get to CRA if they didn't want to. They could still use a government-issued user ID and password. By giving choice, that gave comfort. You're not compelling me, so I'll try it out and see what happens. That choice element is a key component to getting the adoption of schemes like this.