"Send me GUIDE in a private message and I'll share the method." The sentence presents itself as a favour. What it actually does is two things: it moves the conversation off the platform, and it turns an anonymous reader into an identified contact.
This is not a scandal. It is even one of the few techniques whose intent is visible to anyone looking. But it is presented backwards: what is offered to the reader is a document; what is obtained is an address and the beginning of a commercial relationship.
Three forms, one objective
The device comes in variants, and they are not worth the same to the person using them.
"I'm not selling anything. Just send me 'OK' and I'll send the spreadsheet."
The phrase "I'm not selling anything" is worth pausing on: it appears almost exclusively in posts that are selling something. It defuses the objection before it is raised, which is exactly the sign that it was expected.
The question that settles it
It is simple: after the private message, what happens?
If you get the document and the conversation stops, the promise was sincere. If you get the document and then, two days later, a question about your situation, you did not obtain a guide: you entered a funnel. Both exist, and nothing in the post lets you tell them apart in advance.
That is why the technique is worth spotting. It does not say the author is dishonest. It says there is a next step, and that the next step was not described.
The disguised call to action is flagged on the sentence inviting the private message, with the question to ask: does that message lead to an offer? The post's objective is summed up in one line above the panel.
Using it without disguising it
If you want contacts, ask for contacts. The honest version costs you a few replies and spares you the bad ones.
"Send me GUIDE, I'll send it over, and I'll follow up once to ask whether it helped." You lose the element of surprise; you gain people who know what they are walking into. Over time that is better business, and above all it is a sentence you can still stand behind six months later.