You don't even get to vote with the code at times, and sometimes you don't tet to vote with money.
And projects that get the money vote too hard and often end up in Mozilla situation, starving development of important or useful things for marketing features.
You can, however, vote with a fork, but then you end up in the "you forked it you maintain it" situation and big enough projects are too big for even a small team to properly maintain.
Case in point: the perennial ffmpeg fork.