Sunshine = exposure. Sunshine costs: money. Artists who give money, get Sunshine. Thus creating a system where those who have given money, have control over the exposure rates of other artists.
You have a free website on which to host your art because of others, yes. And these same people control the flow of art. Regardless of whether or not you yourself give money, there are people giving money, and those people are given ways to alter the perception of people who may visit the site, by specifically boosting art they deem worthy of praise.
I understand wanting to defend people who donate -- and you're right, I have no beef with individuals. I have a beef with the way this system works. I feel like it's no better than the micro transactions that are becoming normative for mainstream social media platforms, and the micro transactions and loot boxes that are becoming normative in video games.
There is no other access to Sunshine except by way of money. I'm making a plea that this remain a platform by and for all of us, the artists. Abolish Sunshine. If the people coming to this website need a pat on the back for doing some objective good in the world, then why not send out some personalized thank you cards? Send out some schwag?