Companies fail mainly because they spent all their money prior to establishing sustainable turnover. This initial expenditure is what most people consider when assessing risk. However, one should also consider the net investment return. For a large number of start-ups, this return may be zero and therefore a moot point. This may not be the case for companies with valuable tangible assets and/or potential worthwhile intangible assets (such as IP). In such a scenario, investors are likely to get a return. It doesn't matter if that return is nowhere near breakeven; the fact that there is a guaranteed net investment return may pose a problem in meeting the risk to capital condition.
When it comes to assessing risk for companies seeking EIS, companies must demonstrate the considerable risk that investors will lose some, if not all, of the investment into the company. And that if they were to fail, it would be quite unlikely that the EIS shareholders would receive any kind of investment return after the sale of any assets after the liabilities and preference shareholders have been paid.
Not all start-ups and early-stage companies are inherently risky. However, you must consider the worst-case scenario when accessing risk for a start-up, as this is far more likely than having just made an investment in a unicorn.