No one can fool you if you have knowledge of how the world of cryptocurrencies works - and I'm really surprised that some older members are not aware that there is a double-spend option, and that a BTC transaction that does not have at least 1 confirmation should not be considered a transaction at all.

These are basic things that everyone should learn before they even take possession of a cryptocurrency - and fraudsters are successful in their dirty business precisely because they take advantage of the ignorance, unfortunately of a large part of cryptocurrency users who are not even aware of what they are doing. It is not easy to be your own bank, if that were the case then BTC would be used by many more people than is the case today.