Speculating, but apart from the benevolence aspect, probably to establish close links with companies that will use Red Gate products, and ideally (re)sell them to other client companies (hence desire on business-orientated rather that consumer-orientated startups), as well as to ideally make an investment or take equity in any companies that go through the process at a later stage.
But why not ask them directly?...
Neil Davidson
neil.davidson@red-gate.com
twitter: @neildavidson
(http://blog.businessofsoftware.org/)
Amir Chaudhry
amir.chaudhry@red-gate.com
twitter: @amirmc