It's also only on developer costs that are accepted and only on R&D work: none of the business costs etc are covered. In many cases these are just as significant or more.
There's also a reason that a consulting industry has started around it, it's a good amount of effort. Again helping more advanced companies as they can afford the costs for the 2+ year it takes before you can get it back. And again nothing is guaranteed.
Essentially it's not good for startups or smaller companies, it really only benefits companies of a medium size that were alreday going to cover this expenses by reducing some of their costs to increase them growth rate. But for a small company, less than 10 employees it's really hard to actually take advantage of the program in real life.