The five answer pages cover what not to paste. These cover the questions that come immediately after — the ones with genuinely complicated answers, where the honest response is longer than a sentence.
Each one is its own page, because each one is its own question. Nothing here is behind a sign-up.
More get added when a question turns up often enough to deserve a proper answer. There is no schedule and no archive — every page here is written to still be right next year.
If you know what kind of thing you're about to paste, go straight to it. Each page opens with a verdict before any explanation.
If the question is "is there anything sensitive in this block of text", you don't need a page — you need the checker. It reads what you paste in your own browser, tells you what it found, and sends nothing anywhere. You can watch the network panel while it works.