I disagree. Technically the aggregate of "you" is the product. in the case of GNU it propagates via free labor. In aggregate people contribute to the product providing free labor.

I use GNU and don't contribute to any of it's projects. The same is true of the Linux kernel and many other pieces of software.

By and large, my non-contribution to GNU and other projects is a lack of technical expertise. Beyond that it is mostly a function of not being embedded in a community of contributors. However, I'll admit that some small fraction of it is due to a lack of effort on my part.

just like a bunch of people don't click on ads.