They can't leave, they can't opt-out.
If you're going to be this pessimistic about simply existing as a human being, it's worth noting that this is absolutely false. There are plenty of ways to opt-out permanently, and some of them are even peaceful.
Less darkly, there are communes and mutual aid communities and the like. Some even arguably self-sufficient.
Beyond that, if you truly feel existence is that fucking bleak, do you really think it helps to spread this shit to people who might otherwise be happily ignorant to it? Or are you content just making the collective experience of existence worse by putting this out into the world? Explicitly desiring to bring others down with you into the pit because you haven't grown enough to find life worth living and enjoying anyway.
Slap a fur shader on it and ship it!