i don't understand what market there is for such a product. deepl costs $8.74 for 1 million characters, this costs $1.99 for 5000 (in the basic tiers, and the other tiers scale from there). who's willing to pay ~45x more for slightly better formatting?
The same people who'll pay for Dropbox even though rsync is free and storage is cheap: a lot of less technical people who perhaps don't even realise they could do this another way.
(The harder thing is convincing them it's better than Google Translate such that they should pay at all, imo.)
