In addition to everything @big-n-tall said, I also think a huge part of it is that there’s an element of fantasy built into the dynamic and forums like this can unintentionally disrupt that.
When providers show up here as fully formed people with their own opinions, boundaries, and perspectives, it shifts how some clients experience them. The illusion gets replaced with something more real, and not everyone knows how to engage with that. For some, that breaks the appeal a bit.
So instead of it just being about “why don’t they participate,” it’s also about whether the space allows them to exist as real people without being dissected, challenged, or pulled out of that curated dynamic they rely on professionally.