I think this would be a mega useful feature and would encourage collaborative work on this platform, which will encourage higher-quality work. I read a blog post recently on the topic... The main takeaway is that if 5 people want to make stuff, the 1 thing they make collaboratively will be better than the 5 things they make separately.
Rev share will really help make that happen for itch, and I believe change the culture on this platform massively for the better.