I’ve used Haskell a lot and find it to be the most enjoyable programming language I’ve used, so I’m donating because I’m hoping the Haskell Foundation will help both with bringing Haskell to more people, and improving the language even further.
It seems like the Haskell Foundation is in a unique position to tackle some problems in the Haskell space that would otherwise receive too little attention to have much hope of being properly addressed, both because it acts as a centralized focal point to bring together stakeholders with diverse interests, and because it has an organizational structure in place that makes it less likely that efforts will fizzle out prematurely.