Not the person you asked, but I found this list of earmarked uses for the money:

* Improving KDE Plasma & KDE Linux QA Infrastructure

* Improving KDE Plasma’s Recoverability Mechanisms

* Implementing Factory Reset Functionality for KDE Linux

* Improving Security Infrastructure for Organisational Usage across KDE Plasma

* Improving Data Backup and Restore Systems

* Strengthening Configuration Management as Core Desktop Infrastructure

* Improving Network Shares Experience

* Building KDE PIM QA Infrastructure and an End-to-End Testing for IMAP4 and WebDAV

* Supporting IMAP4rev2

* Supporting WebDAV Push Notifications

* Standardising Account Configuration

* Improving KDE PIM Suite Desktop Integration with Flatpak-Based Delivery

So at the very least, the QA Infrastructure and Security Infrastructure will almost certainly result in quicker finding and reporting of upstream bugs, and potentially even KDE devs working on fixing those upstream bugs.