Every state writes its own cottage food rules: what you can sell, where you can sell it, what the label has to say, and how much you can earn before the rules change. General marketplaces don't know any of that. Generic bookkeeping apps don't know what a market booth fee is or what a jar of jam costs to make.
So home food makers end up stitching it together: a storefront from one place, payments from another, a spreadsheet for sales, a shoebox for receipts, and a search for their state's rules every time something changes.
SellFood.com puts it in one place, built around cottage food. You list your products, buyers find them, and you get paid through your own Stripe account. The state rules and the business tools sit right next to your shop.