> Two kinds of purchases are possible: one-time purchases and subscriptions.

I’m surprised they’re not charging on a $/GB saved model.

If you're referencing Fetch for mac (pre macos) or Transit by Panic (later renamed to Transmit), I was a fan (and I've been a terminal fanboy since the early 80s). Both of them started as FTP wrappers, and both provided convenience the cli lacked.