I'm not quite sure what your point is here.
Google (which is really outside the scope of this forum) is free to ODP our data in accordance with our
licence agreement, which they do to make their 'google directory'. They also sometimes use ODP titles and descriptions in their search results pages (presumably they think that they their users more useful information than the alternative of using text from the site itself. This is all Google's choice, and nothing to do with the ODP.
At the ODP we strive to create a useful and comprehensive human-edited web directory. The people we serve are surfers, not webmasters, and we do not really care how our editing affects sites' listings in google (or any other search engine) how they choose to use our data is up to them. That said, it's my understanding that a link in the ODP will be treated just like any other link in the google algorithm. It may be on the high end of some sort of authority weighting system, but at the end of the day it's just a link. Admitedly, if other sites choose to use our data and also link to listed sites, a site may get several links from one ODP listing. But again, such links are beyond our control.
Perhaps you should think of the additional links and Google's use of our titles and descriptions as validation that other people think our directory is indeed useful to surfers.
To address some of your specific points:
nobody can influence your ranking in google
That's clearly untrue in the way that you're thinking -- anyone can add a link to a specific site, and thereby give a (possibly only slight) increase in that site's ranking.
A single link from DMOZ used to be the difference between a page 5 listing or a number I spot for a given keyword.
I think that's a bit of an urban myth. Even if it was once true, it certainly isn't today.