Actually, depending on who owns the story, that is the person who gets to post it on the platforms, or both can do it, but lets say, one posts it on webtoon and the other on tapas.
Or come up with a new account for the collaboration where both artist and writer can manage.
Unpaid collaborations are not bad, regardless if they profit (highly unlikely). I believe its a good experience for two novices, but I personally believe it should be something that actual friends or people that know each other are willing to attempt, it is less possible for total strangers to succesfully work together, especially if its something long term.
When you offer yourself to something unpaid, well, eventually it happens that you may see there are other oportunities that are more benefitial for one self, be it a personal project instead of someone else's, a paid gig and such.
It can also happen that due to not being actually something of value at risk for one of the members, some just can quit or they won't feel obligated to put more effort than what they need is fair, for example, one won't necessarily stick to a deadline or feel guilty to keep the other party waiting, there is actual obligation to deliver things in a certain quality or in a certain period of time.
Compromise is limited and not a must for these collaborations, not to mention that many people have a terrible habit of thinking others will see the same value to the story, when in fact it is not their passion project, even in paid collaborations people cannot expect "a partner that is as passionate and invested in the story as me!" because to many it is only experience, something to do, or a job. With time, surely certain feelings may bloom but one cannot expect others to love a passion project that was solely created by oneself.
Not to mention, there is also a lot of expectations put on the volunteer, to deliver a certain image or respect the artistic vision of the real owner, but these people are not really that flexible, many are so stuck on their idea needing to be perfect that they don't see these things:
- If not paid for, one cannot demand a certain quality
- If one cannot afford it, then considering a different format for the story is important (Can't have your story as a comic, then write it as a novel instead of not doing nothing)
I'm an artist myself, but if you have specific questions regarding an artist POV then I believe I could answer more things, but to me the ones mentioned give an idea about collaborations, of course, not all of them are necessarily bad, but its important to be aware it is higihly possible for these situations to happen
