, learn how to comprehend an answer, then read my answer to you.
Some airlines are treating it more seriously than a paper form, and more like a visa; if you have lived in many countries, you would understand different countries and airlines interpret things differently than the host country of a new procedure.
Later it will all calm down, but for now, it is complicating things in some countries and with some airlines.
For TDAC, it has more powers than the paper forms, even if unintentional.
If you have not completed it, some airlines, from some countries will not check you in (or at east make it a big hassle); I flew from Bahrain and the staff at check-in wanted to see the printed copy of my TDAC before checking me in.