They actually did promise people something. They have it written everywhere, and it's very clear. Companies have been sued for far less in terms of false advertising. Whether or not you think it becomes null and void due to terms of service is a different question, but they definitely promised people something, in writing, convincing them to sign up.
They promised that you would keep these rewards as long as you remain an active PM customer. It's pretty black and white right there. Sounds like a written agreement (a promise) if you ask me.
Guess what, if you were promised a lifetime warranty on those windows, and you have that in writing, you can take them to court (assuming you are correct, and the lifetime warranty covers exactly what they said it would cover, in the contract), and you would win. This is why courts exist. Consumer protection is a thing.
