I can't really wonder how will (if ever) someone will fall on this trap.
Even for let's say they aren't aware to what happens in Bitblender, using mixing service can be consider as advanced knowledge, therefore, those people should be, at least, will do some basic and proper research before proceeding to verify that they are dealing with a legit company.
In an ideal world, yes. But people get scammed everyday. And you can’t just assume everyone using a mixer knows what they are doing or know how to differentiate a website from a phishing one. How many coins were stolen in the Electrum fake messages fiasco?
There are websites (usually “Top 5 mixers” and similar) made only to advertise these fake mixers. They will link all the legit mixers there but with their respective phishing websites. And these get a lot of victims.