Yep although to be precise it's a pay-for-a-year-of-updates model, and the underlying macOS APIs in this space change significantly between minor and major macOS releases, so ymmv in terms of "pay once forever". (For upcoming features like shareable links, they'll presumably move to a part-subscription pricing model.)

Agreed, as far as I can tell, this is the only one in the space that doesn't insist upon a monthly payment.