What you're saying is that Poland is reliable - although (even though?) - it siphons off gas for its own use without paying for it. I guess Russia is supposed to be grateful that Poland doesn't take 100% of the gas?
The Poles have only themselves to blame for the Germans and Russians building the pipeline around them. They got too greedy.
The Poles have been extracting actual cash out of Gazprom, lots of it, taking advantage of its weakness a few years back when it was literally the back against the wall. In the long run, we're all dead. John Maynard Keynes
In any case I really don't think that that is the main concern of the Poles. Any such cooperation between Germany and Russia bypassing Poland is going to make Poles rather upset - two centuries of history and on the Russian side, though not the German one, a disturbing understanding of that history.
