You're also robbing yourself of increasing the prices to keep the lights on. Business-wise this is not a very good idea. Also as a customer I have the feeling that this is a stupid idea. If the costs increase, you have to increase prices. If I like something and want to keep using it, that's the only way.
Similar thought, but also thought this is setup for a lawsuit - I mean, I get lifetime unlimited video storage for $9 a month? I can already think of several ways to abuse that and then complain.
“For the lifetime of your subscription“ still lets them cancel the subscription unilaterally without breaking the promise. So if they want to hike the price of existing subscriptions, they can still legally say “agree to the price increase or your subscription will end on X date, after which you can choose to re-subscribe at the new price if you like.” It just prevents them from automatically and unilaterally increasing these subscriptions’ prices.
It also might not prevent them from amending the fair use terms of the subscription to require paying overage charges for unfair or abusive usage patterns, without unilaterally changing the monthly price.
Highly doubtful, I have been cheated out of lifetime guarantees so many times. Latest when the company is sold.