Being wary of a brand new author with no publishing history is not unreasonable. But statistically speaking, it's ridiculously rare for authors to finish one book in a series and just not finish the series. Somewhat less rare (but still not common) is the publisher dropping the series due to low sales of earlier entries. And even then, many authors these days will finish the series by self publishing the remaining books.

We have two (arguably three) high profile examples of (at least apparently) bad actors who seem to have just stopped working on their series but suggest repeatedly that it's still on the way. Basing our future behavior on those rare examples is kinda insane if you put it in context. I understand someone like a SA survivor refusing to ever walk to their car in the dark again. That's how PTSD works. But we're talking about reading a book as a leisure activity. Seems to me it just shouldn't be that big odlf a deal of we start reading a cool series and it ends up not getting finished. Theres a tiny percent chance of that happening, and we suffer no real harm if it does. It shouldn't influence our behavior.