GN gets its revenue entirely from advertising. By consenting to all, that allows advertisers to target your particular interests and therefore more of them are attracted to GN increasing its revenue base.
If forum members wish to see GN survive then consenting to all will help greatly. It has to be remembered that competition against GN is Twitter and Facebook who are the ever growing giants of social media these days crushing all others in its wake.
GN has a small, older, largely single-gender base and it is obviously now becoming a struggle to survive I feel. So, do forum members wish to help it in that survival or not.
That has to be the decision for each to take with the consent form.