What’s the test? Your registrar can see if you have MX records, or they can send a test email to those records, but that just means squatters need to stand up 1 mail server and set all their MX records to point to it.
Currently squatters aren't even bothering to setup the countless domains they own for that example. Sure, they could automate the process for their collection of domains but someone could always draft the policy to make a person abusing the system to get banned from the domain registry.
