Earlier quoted context omitted.
Assuming that you're working remotely for clients who are outside of Thailand, is this actually a problem? I've worked from various places while traveling, and never worried about this, though obviously it would be an issue if you wanted to pick up local clients.
It is _absolutely_ a problem if you're working remotely for clients who are outside Thailand. Will you get caught? Probably not. Will you get caught if you keep showing up at co-working spaces now the government is cracking down on visas? Are you feeling lucky?
E.g., before I had kids I spent a few months traveling from Western Europe down to Turkey, working along the way -- probably in about 10 different countries; countries don't reasonable expect you to file taxes if you happen to do some remote work in them for a week, do they?
Obviously this will vary per-country, but I'm curious if you know how it would play out in Thailand, at least, if you did everything by the book.