I can’t find KDE’s financial report, but in a video I watched it was claimed that Thunderbird collected more donations than KDE. It seems quite hard to believe, but in 2022 Thunderbird collected more than 6,4 million dollars.
KDE is an entire desktop environment, with a bunch of applications and even partnerships that have yielded a KDE laptop. Should Thunderbird have been able to collect more money than KDE itself, there might be something that KDE can learn from Thunderbird.
Edit: Added the link to the video that I watched
I’ve heard of this before, but as far as I know that no longer exists. Most of the KDE apps available on other operating systems can be found here: https://binary-factory.kde.org/. Okteta is indeed one of them, available on both macOS and Windows. There are definitely a fair amount, but many of these ports are in rough shape and this is still a small portion of total number of KDE apps available on Linux.