I get what you mean: Malaria vaccines never got a sudden rush of Manhattan-Project-esque funding like COVID-19 vaccines. But according to the study, funding for this research was provided by "The European & Developing Countries Clinical Trials Partnership (EDCTP), The Wellcome Trust and the NIHR Oxford Biomedical Research Centre".

The EDCTP is funded by the European Union as well as the individual member countries. The Wellcome Trust and Oxford are both British.

Perhaps wealthy nations could/should be doing more, but it seems like wealthy countries are responsible for this breakthrough.