It’s fairly common to give a (sense of) a good deal to new people while raising a bit more money roght now than you would with a traditional subscription.
Then later when you start getting more users quicker you cancel that offer and nee users have to use a subscription (which will make you more money over time).
Protonmail did something similar originally, giving out Visionary for life for a (large) one-time fee. It’s a decent strategy to raise money from people who believe in your product.