Congrats and good luck! I hope that running the business won't be too much of a distraction for you from working on the project.
After reading your post, I was surprised to see that the Atuin website doesn't mention pricing anywhere for the hosted service. Please provide that info.
For Atuin itself, is there a way to annotate commands or sets of commands, like giving them descriptive names/titles instead of just searching by the command names themselves? There's plenty of commands that I use rarely that I likely wouldn't remember the actual name of without some more context info/personal notes.