@Nick *****
You are so funny, you just seem to believe this yourself!.
Of course DTV is meant to attract visotors, but not the type that only gets a cheap training for a few months and then just abuse the visa, they are of no value to them.
And allthoug I might live in my own world according to you, at least Google AI is also in my world and does not share your opinion.
"It's essentially a conditional authorization, often placed in a passport, that allows a foreigner to legally enter and potentially reside in a country for a particular purpose"
For a particular purpose, also not a "trick" like you suggest just to get in everybody.
When your idea really was true, why would they have requirements then?