I don't know if you're wording it way because you're doing a bit or you didn't look at my username?
> you know what is a PR
This part doesn't make sense to me.
> and what is a demand for a free work
And this is not a demand for free work.
If I comment on a project that I'm going to keep using an existing product because it has this big entrenched feature base, that's the exact opposite of being demanding and binding myself to a project. It's an acceptance of the status quo. It gives some feedback as to what people find important, but it's not a request to implement half of google docs, and it doesn't make sense to try to invert it into an invitation to submit a PR that implements half of google docs.