Dark Matter in the accounting software universe

Why can't we see everything in the known UK accounting software universe?

Why can't we see everything in the known UK accounting software universe?

The ICAEW conducted research in March 2016, looking at the readiness of UK small business for HMRC's new Making Tax Digital initiative. 

Using the survey estimate that 75% of UK small businesses do not currently use accounting software, the calculation of UK businesses that ARE using accounting software gives a figure of 1.25 million.

I struggle to get my estimates of the user numbers for Sage, QuickBooks, Xero, KashFlow et-al. to total anything near a million.

This suggests that either [a] the ICAEW percentages are not accurate or [b] there is an unknown, invisible accounting software provider making up the difference between the visible software companies and the total.

A bit like "Dark Matter" in the universe?