@Siggi ******
if you want to believe that, okay. With your working in Thailand with a Thai work permit, I'm sure you believe that you have all the answers.
Reality is, unofficially, as long as one stays "under the radar" in Thailand, working on-line using whatever Thai Visa or not, with extension is okay.
Get reported, that's when it becomes a Thai immigration issue of legality and a problem for you.