What to do if/when WebVfx disappears

That’s really sad to hear.
I personally use WebFx exclusively for the “Text: HTML” filter.
As far as I understand @shotcut, he tries to use a different “rich text” architecture:

(…I am looking to add another rich text technology from Qt that is still supported, and it has very good visual editor support. It is much more limited than HTML5/CSS/JavaScript/WebGL/Canvas but satisfies a lot of basic textual needs.)

For example ‘OBS-Studio’.

The best and popular screen-, window-, game- and streaming/recordingtool. :smiley: