Is what they're doing legal? I'm pretty sure a tourist visa means you can't use it for work (activities for which payment is received or capital is gained), even remote work. I'm told that the Thai government is pretty harsh in punishing such things.
We were there on holidays ;-) But I know what you're talking and while what we're doing is technically a gray zone, what the government is after is mostly freelancers that basically live in Thailand, but are not paying taxes there and are constantly on a visa run to re-enter the country.
No, you stated you were working. From your article's title: "Working Remotely From A Tropical Island In Thailand"
> what we're doing is technically a gray zone
Did you file a tax statement and did you pay any taxes on income earned while you were residing in Thailand?