There's only one thing to understand about SMBs: They're woefully inefficient. Efficiency comes with scale (which is enabled by automation). This is what turns previously artisan projects (e.g. clothes) into mass-produced items that can be sold cheaply and help improve living standards. SMBs run counter to this: Most of them don't want to grow and most are poorly run. (The ones that are well-run and are founded on interesting concepts have a habit of growing out of the SMB category.) What's left is your local drycleaner, restaurant, independent greengrocer; a lot of them industries that automation hasn't been able to help scale. Yet.