So far no. Future no one knows. Anyone who claims they know is making it up.
I suspect some controls may happen but it seems more likely if and when they do extensions.
There is a sense that this is too good to be true in lasting 5 years. So maybe they seek control later, but I can think of no other multi entry visa where they reviewed eligibility over time on entry. Insurance being a small exception for OA but not really same.
Anonymous participant it used to be 5k agent fee and then usually plus insurance which was high 3.. then the insurance went up (over 5k) and so it was a combined cost of 10 - 12 back before the DTV.
These have risen.. At least that seems to be the case with the chiang mai agents.