That is about funding of BlockNote2 development: WYSIWYG HTML editor for the rest of us that will work on Windows, Mac and Linux.
BlockNote editor was free last 10 years and if you have found it handy please donate if you can. Each river starts from a small stream.
As a part of this campaign I am also offering discounts (up to 50%) for Sciter license and source code access. And yet advertisement spots on BlockNote front page. Note: that space and number of offerings is limited.