It really is a matter of scale. One that Jinx, on her own, simply cannot fill.
And that will be an important lesson. For her and Alchemist alike.
The question then becomes what all needs to be done about it? Increasing cybersecurity is one avenue. Cloudflare, IP logging, sales limits and similar are all things that have been done in the real world with some measure of success.
After that, what else?
Adding further enchantments for the sake of security is possible, of course, and after a certain level of skill would be quite doable without an increase in time or magical investment. That explanation will come later in the story, however.
But the true crux of the issue is, as was said in the beginning, a matter of scale. Alchemic Solutions will need to grow beyond just two people to properly thrive and meet the demand for their product. Especially if those products are, by design, one-use only. But it will be somewhat difficult to expand given that, between Alchemist and Jinx having multiple specialties as well as perks and skills that multiply results, the two of them together are equal to a team of forty or so people.
That is, charging soul gems, repairing soul gems and then actually performing the enchanting.
Now, I do have an idea for a solution... but it would require tracking down and capturing magical cat people in an Instant Quest, and that would only be a stopgap until it's time to scale up further.