I think it’s just an expression and doubt that many who write comments like this really mean it. I see it more like a way of saying ‘that’s a tense situation. I’m looking forward for the next chapter to see how it works out’
What frustrates me tho is when cliffhanger do not pay off. Author builds up a real neat situation, ends the update with a cliffhanger...and the next updates starts with a really simple (or dull) resolution. Sometimes they even avoid resolving or properly address the issues of previouse chapters entirely. That made me stop reading several premium comics on Tapas because I felt kinda cheated...
That should be illegal....but on the other hand, that might be just writing style and maybe I’m guilty of doing that too here and there
But aside of that, I love cliffhanger as reader, although they make impatient at times too