I see that flightsim.to is back up, and I went to see about how to donate, buit they have this message:
Which I think is probably a good thing. If they charge a modest annual fee, then I think many people will think that good value. I’m thinking of something like sortitoutsi.net which is a similar kind of site for Football Manager. They host many downloads and helpful tools, and charge £10 per year to be able to download from the site. I don’t think many would object to that, especially if that helps to secure good servers and decent download speed and helps to give a means for devs to get their content “out there”. Coupled with the great feature of tracking your downloads and flagging when updates are available, I;d happily pay that.