This makes an interesting startup idea. I'm sure those tens of millions would be thrilled to only pay hundreds to a specialty USA startup instead of thousands

This makes an interesting startup idea. I'm sure those tens of millions would be thrilled to only pay hundreds to a specialty USA startup instead of thousands to local tax accountants. A theoretical annual market revenue of a billion bucks is not bad. A bit over three million customers is not totally unreasonable, and a third of a thousand dollars is disruptively cheaper but still multiplies out to a lot of revenue.