I do know that one needs a work permit to work in Thailand. Quite easy to comprehend.
But it seems you have difficulties to understand that it is your interpretation of the law and nothing else if you claim all proessional activities are defined as "work", even if it has nothing to do with Thai labour market, Thai tax system, Thai laws and the only possible connection to Thailand is to use a domestic ISP.
It would be more than your opinion, if you had ONE example of a foreigner was charged for illegal work because he took part in anonline meeting or wrote a software script for his company at home while relaxing besides his pool.
And by the way "retired but working more"? Do you have a work permit? or is your work no work?