Much like each and every climate change related tech.
There is no guarantee that the public will be interested in space or climate change 10 or 20 years from now, and space missions which are not telecommunications satellites entirely depend on the goodwill of taxpayers to keep providing the financing.
The alternative model to taxpayers money has been private investors believing that space would somehow change and start yielding some more standard ROI after decades of atypical ROI (mostly morale boost for the nation every time a rocket went up). But that's just the financial capital part, the revenue of the aforementioned companies still comes from Government contracts.