Has the Thai government ever canceled a visa option like the DTV?

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It’s Thailand, anything can happen from one day to another.

Brandon is right. But they want to attract more people to visit Thailand, so IF a visa kind is canceled I think it will take some time. And I don't know if it has anything to do with it, because I'm not an 'economics guy', it seems to work if I see the strength of the Thai Baht.

I think that they will soon change DTV visa requirements and it will be more difficult to get it, many people now say that its too easy and too cheap …

Will see …

I've never heard of them cancelling a program before it was scheduled to end already. For example the STV (Special Tourist Visa) that was issued during covid, that allowed a 90 day stay, and could be extended 2 times for a maximum of 9 months in Thailand. It was a temporary program, and after the program ended some immigration offices also stopped allowing people who already had the visa to get additional extensions.

Is it possible for them to end it? Of course, they gave it and they can do whatever they want.

The most likely thing if they ended it would be that they still allow the people who have it to continue until theirs expires.

The worst case scenario would be that they immediately cancel all DTVs and anyone with one can no longer enter Thailand with it.

The middle ground would be that they cancel the program so no one can get a new one, and then severely restrict the people that already have it by requiring them to show proof of an ongoing class/medical treatment, or proof of remote work and their bank account each time they enter Thailand until the visa ends (slightly similar to how anyone with an OA visa must show their required health insurance each time they enter Thailand with the visa).