I heard a reknowed scholar of Pakistan say tha our ullama say we should not discuss much about dajal as everyone will know when he will appear
I have so many questions. Then why do we always refer any new technologies or dollars or freemasons or illuminati as dajjal? is it right?
If these things are to be regarded as dajjal then they have been present for around centuries?
What is our responsibility about it?

There is nothing wrong in discussing Dajjal for the purpose of enhancing one’s knowledge on the subject. What you mentioned above are what some considered agents of dajjal. This cannot be entirely truth and require further examination.