I made a donation once, with the idea of making one every year, because I believe in paying for the things I use, and particularly small-time, old-style services like SDF.
But the plain and sad reality is, most of the things I DON'T pay for work much better than SDF services.
So yes, it truly was money poorly spent. It wasn't much money and it didn't make a dent in my quality of life in any way, but that's just what it was - money poorly spent.
My one donation will remain a single donation until SDF services improve to the point when I can convince myself that the occasional slowness and downtime are reasonable for a small gig like SDF. Sadly, it's not even up to that standard, and has never been in the 2 years since I've joined: it's more slowness and downtime than it is working normally.