Good. But I do wonder why we're flooded with "services" like that when a simple open-source Python script could do this. $150 FFS. I hope you have clients but the open-source dev inside me is dying a bit.
People pay to have their problems solved, not code (although code is one of the ways to solve some problems!). If you made such a service for free, that's great! It's helpful, it scratches an itch to build you have, it is a net positive to put it into the world. Importantly, non technical people want their hand held and usually, are willing to pay for it. Something to consider. There is room for both solutions and code, based on bucketing of use cases and personas.
https://github.com/ashishb/wp2hugo is pretty good. That said I think there's probably room for a good solution that doesn't require command line proficiency.
In my case, at least a big part of it is I'm looking for a job again and doing something like this to get myself out there, I already had one person who was interested in this specific type of conversion so maybe there are others.
Thanks for the 413 note! I've just upped the client_max_body_size if you want to give it a try again.
Edit: 413 Request Entity Too Large.