Vouchers are a bit of a scam?

[Flowerslamp]

Companies must make a fortune from vouchers that are bought and never spent?

They must, yes. That's not a scam though.

Vouchers no longer have an expiry date in Canada. That's the way forward.

That's not a scam. That's the incentive for companies to offer the vouchers at the first place. And it covers all the associated costs, so gift vouchers don't have to cost more than their nominal value.