I don’t know where you live but where I live in Thailand you can be sure that if you, as a Farang, don’t wear an helmet while driving a motorcycle , you will be stopped by police and fined. While a Thai family of 3 on the same motorbike with zero helmet just in front of you, won’t … So the police does enforce motorcycle helmet law … but only for Farang … Might be the same for tax laws enforcement … and it would be super easy : they just need to link taxes and long term visa extensions.
Moreover for Thai tax residents (you will become one if you stay more than 180 days in a calendar year) there is a new tax law in the pipeline to tax worldwide revenues . And not only money transferred into Thailand . Google « Thailand tax worldwide revenues » and you will see the whole picture.
And to answer your question: no insight on taxes offered whatsoever.
The answer is clearly : No. Please don’t believe the misinformed folks or the liars: there are plenty on here.
It’s very simple: if any physical work is made inside Thailand then you need a work permit. Even voluntary work is not allowed under a DTV. DTV is ONLY for remote and digital working. Got my answer from the BOI in Bangkok. You can’t get more official answer than that. I would recommend you to ask them directly and not Facebook…