It is a lie if they use it as if they were a full-fledged member of a community while not actually being a true member of said community.

If I disguise myself as a man, that does not mean that I can go the male restrooms. If I am asked for proof that I am actually female for some reason, can I decline showing such proof?

And regarding arguing in bad faith, I was not arguing. Maybe you are not aware of the expression 'lying by omission'? But the smileys I used were supposed to make obvious that it was a joke/tongue-in-cheek. Even the initial question was tongue-in-cheek. Do you sincerely believe that I expect to receive some credit card info?!!!

Ack that this example might not be best since the lie in the first place is the disguise. But, not everything is ruled by law, especially online. Which is also the point of the question.

"It is a lie if they use it as if they were a full-fledged member of a community while not actually being a true member of said community."

That would be a lie, yes. (I found your example above not clearly written and still am not quite sure what you meant exactly)

"And regarding arguing in bad faith, I was not arguing. Maybe you are not aware of the expression 'lying by omission'? But the smileys I used were supposed to make obvious that it was a joke/tongue-in-cheek. Even the initial question was tongue-in-cheek. Do you sincerely believe that I expect to receive some credit card info?!!!"

Asking for information and someone declining that information has nothing to do with lying by ommision. That you try to make a connection here is what makes me believe you are not debating (or talking about or whatever) in good faith.

"But, not everything is ruled by law, especially online. Which is also the point of the question."

But this is about a concrete community, where my point is, they can very much rule certain things by their law.

And to me by default, lying is evil. And not banning those who lie (which was the starting point here).