From Indie Hackers site:
"Anyone with a business or side project that's generating at least $300/mo in revenue. There's no upper limit. Of course, you have to be willing to share your revenue — the point of this site is transparency!" Source: https://www.indiehackers.com/submit
I think we have the "right" to know what the transaction entailed; how much the owner was exactly paid, that is.