Non-profit operations have customers too. I think they’d better achieve their mission with a nice website, referral revenue to help with upkeep, and an iOS app for wider reach. People live off of their mobile devices, especially the people that most need free software. I’d totally understand if they don’t have the capacity to do any of that though.
Unless the project itself is about the web, a polished fancy website is to me a yellow flag that the project is not open source first but trying to sell me something.
A lot of open source projects that are serious about the actual software have ugly websites or even nothing beyond a README.md on Github.