This is a screenshot of a section of the text input box in jumble.social 
Unlike you, I'm not lying about what the screenshot depicts, and it's actually possible for the screenshot to be what I say it is (because it is).
But I can recognize right now, in the first post I've ever included that screenshot in - the screenshot doesn't prove my point, and neither does my explanation. If you think it's impossible for there to be a text box in jumble.social then you're obviously not gonna be convinced by me posting a screenshot and saying that's what it is.
If there was no text input box in jumble.social and I was trying to convince you there is one, I might not want to admit this screenshot doesn't prove anything. I might post this screenshot just so that later, I can say I posted a screenshot as proof, while I'm accusing you of trying to make the thread more complicated.
On the other hand, if self-custodial lightning is possible, it's strange that I can't understand how your screenshot proves what you seem to think it does, and meanwhile you refuse to explain, while accusing me of trying to make the thread more complicated.