No, of course not. The disappointment is that DAN and the agencies do so very little to warn or the dangers or suggest the importance of tank testing. DAN did gift Meridiano with Analox inline monitors, but those can be ignore when busy - the time a compressor is most likely to produce CO internally.
The problem with DAN and the agencies getting onboard with the need seems to be money. Telling students that they need to buy & use tank testers could greatly discourage new divers and the business they bring to the sport.. With the continued lack of sufficient exams disclosing CO injuries and even deaths, and with such being written off as travelers flu and drowning, the companies can continue to ignore the risks.
Why is it DAN's responsibility ?
I personally think of DAN as an emergency network for Divers. They don't sell courses other than First Aid/Emergency First Response in some regions.
If anything, it should be taught in OW, much the same as O2 testing is taught in Nitrox.