Currently it’s unlikely that immigration is going to question whether or not you’re still engaged in a soft power activity.
That being said, you would no longer be fulfilling the conditions of your visa and the immigration officer has the power to deny you entry or to only stamp you in under the visa exemption scheme (if eligible).
If immigration ever wanted to crack down on the DTV, the easiest ways to do so would be to demand recent proof of status (remote work or soft power course) and/or financial proof of 500k THB.
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