so by that logic , if you do an English ED Visa in Thailand you would also get checked , which is not the case. Also if you do ED Visa Muay Thai or cooking, immigration doesn’t check you ! Only if you study Thai in ED you get controlled ! You cannot even compare non Imm visa with each other. Logic doesn’t apply based on your argument !
well you book a course which has a 6 month duration. Leaving after 2 months implies no interest etc..with ED Visa Thai language you‘d get interviewed for sure