Reciprocity is the tendency to respond to help or a favor one has received. In marketing, it can explain the sequence of offering useful information before inviting a further action.
The demo compares an immediate signup request with answering a question before offering an optional signup. Its arrows show sequence only and make no claim about conversion lift.
Do not impose an unwanted gift to create obligation. Free information should stand on its own, and declining the later request should carry no penalty.
When to use
Use it when answering a real customer question before inviting signup.