Another example to play around with is when you go camping with friends. There's some shit work that just needs to be done. People pitch in. The same with staying at a friends house or a vacation rental with friends. Or cleaning leaves off of the storm drains. We all do this sort of work because it makes our lives better. If literal shit was piling up in front of my house I would probably shovel it even if it took 8 hours.
Natural disasters are also examples where people do work for free without expectation of compensation. I think people are more like that than what happens in apocalyptic novels (even though I love reading them).
I think one thing people keep forgetting is that all these problems have already been solved for hundreds and thousands of years. You will never reduce inequality, abuse, pain, suffering. It's much better to contribute and improve what we already have rather than to rip it out and try "yet another variation of the same utopia that we've all been thinking about".
Build towards it, not "start again "
This is another view common to most (Marxist) communists, the belief in society's ability to cultivate the 'socialist man'.
Didn't you have some assigned group projects in school? Perhaps some people are easily satisfied by carrying the burden of other people who they don't know and who don't appreciate them, but I'd wager a ridiculously high majority of value producers would not be. Humans are social animals, but we're individuals first and foremost and self-interest will always be the best motivator.
Is there some future where humans are engineered to be satisfied with a predefined role and purpose, amongst other traits? Sure. But until we get to that point, commune-style living is an absolute dud.
By the way, I recommend you visit and try living in an actual commune. My girlfriend told me it was the most disgusting living situation she's ever seen.
We still generally have a culture in the US of respecting our veterans and service members, for example. There is some social value in serving that's not material. If there wasn't, the material benefits would need to be more substantial.
I also visited a couple of Greek Orthodox monasteries and they were not just nice but beautiful. So for small scale communities with a strong cultural binding "communes" can totally work. It doesn't scale though.