Considering it is a one-time payment, it would be nice if I could use my own API key.

Although you call it a "no-tricks pricing" model, a 'one time lifetime license' for a product that I can't use the key feature of without a subscription after a year isn't a 'no-tricks pricing model'. Unless I am misunderstanding?

Although the product looks great - just maybe needs the words changing and making it clear what capabilities don't require the subscription.

Might even be better removing the term "no-tricks pricing model" too, because if anything the license model is a bit more tricksy and more ambiguous compared to most other applications imho.