I'd personally be willing to donate the 5€*a month to keep the infrastructure running.

But I'm frankly pessimistic that this would work in the long run. Even if somehow it'd work at first, people would start dropping. And getting replacements would be hard.

I hope I'm too pessimistic about that, but I do home some other more sustainable way can be found. Like some others have said, advertisements maybe, or sponsors. But I have no idea unfortunately what would be a realistic option.