Scroll down. TiddlyWiki is outdone by SilverBullet, which is only 3 years old.
It is what it is. I think the nature of that software differs quite a bit though. Most of these are highly hierarchical wiki/note environments (e.g. Nextcloud Notes, Joplin) which have a limited interface when it comes to linking and re-using information.
I recognise most of these and had a quick search for the others. I would say Obsidian (if set up a certain way), Outline, AFFiNE, Silverbullet and Logseq are closest to TiddlyWiki.
This is a survey for people who self-host (by implication for others) and we know from our own survey that most users use TiddlyWIki in a personal capacity. So we are looking at a very technical userbase in this survey, but Obsidian makes it very easy to share your wiki or just parts of it (which needs a custom solution in TW) - as well as having superb documentation, and I think that all contributes to its popularity.
I don’t think self-host implies “for others”.
Possibly, but Bookstack for example is quite high up and it is explicitly designed for small-to-medium enterprises, beyond just personal use. It has rich permissions features, for instance, and other aspects around the idea of multi-user collaboration.
But I will concede that we don’t know for certain how the participants use these applications, and it may be unwise to make assumptions on the aspect of sharing a wiki.