I don't know about currently but they were on the ESTA form, if you were traveling from a visa waiver country. I guess it's possible that you don't see them if you're on a "real" visa instead of a waived one? And my information isn't up to date so they may have removed them. But it's absolutely not myth, those questions were real.

It absolutely is not a myth. I've had to fill in forms along with all other passengers with that question and other similar questions, when traveling to countries such as Australia.

I applied for a US visa about a decade ago and was faced with the question (it literally blew my mind, I probably still have a screenshot of it somewhere) and this year my SO was filling this electronic visa and he faced something similar afair...

N-400 asks something along these lines. It doesn't say planning; it's broader, really. Any membership in an organization that wants the US to be a single-party state counts.

https://www.uscis.gov/sites/default/files/document/forms/n-4...

Part 12, question 10-11: "Have you EVER been a member of, or in any way associated (either directly or indirectly) with: The Communist Party?; Any other totalitarian party?; A terrorist organization? Have you EVER advocated (either directly or indirectly) the overthrow of any government by force or violence?"

Ironically, most of our political leadership doesn't qualify to become a US citizen; they've almost all advocated for the overthrow of Iraq's government by force. I'd imagine in practice some governments are more equal than others here...

Do you plan to could be no when filling out the form but you still do it later. The form will still be correct

Pretty smart actually, wrong answers would give them the opportunity to either deport or arrest people, and then see what else they can find. Not supporting that, but the idea itself isn't bad...