It's not just image hosting, it's also video and audio hosting, and has albums. It's not invisible, most people see it by landing on one of our pages. We don't get any donations, it's just that we get less than our ad revenue. Both of those combined isn't enough to cover costs, though.

I'm not really about to defend why it's better than any of the other gazillion sites, feel free to educate yourself on it instead: https://mediacru.sh/about