The reason is also pretty simple: Most german startups I've seen were some more or less (mostly less) good ideas from rich economics students - and they are looking for developers that are badly paid, get little benefits and have to work out all the issues - as a thank you, they get nothing in return if they are sold or die.
Additionally it's extremely hard to get funding - there are some programs like EXIST - www.exist.de but this is also shaped pretty much for economics students and offers little help for a technical startup.
It is commonly accepted that it is business people who build businesses, and technical people are replaceable and should be hired as cheaply and easy to dump as possible, and not approached seriously. Sometimes literally lowest bidder gets the job.
Same thing in Russia. In almost every startup i saw here in Cy started by Russians, founders have no idea how to code. They mostly siphon off cash from someone rich and dumb enough. Naturally technical part doesn't matter all that much to them.
Additionally it's extremely hard to get funding - there are some programs like EXIST - www.exist.de but this is also shaped pretty much for economics students and offers little help for a technical startup.