Here it is simply: If you cannot swap your funds from Crypto #1 to Crypto #2 within the average blockchain confirmation time of Crypto #1 and Crypto #2, you are getting scammed. If you cannot understand this, then it is likely you do not know how blockchains work; and by extension, these "swap" services either don't understand either, or are simply using your funds for a certain amount of time beyond these average blockchain times.