It's not for you to determine that. Any money coming in will have to be declared whether you think it attracts tax or not. It's going to be interesting times, with a lot of tears before bedtime
'if you dont report yourself to the taxman' sounds like advice to me but fair enough if that wasn't your intention. Of course deportation would be dramatic, but it's always an option, depending I imagine with level of offending, ie one off mistake or clear evasion, and of course as in any country once you're on that radar most authorities don't stop there. Not paying it on time, sure small fine. dodging the taxman for 12,13,14 years probably not a fine right? As for the scale of the operation, a recent Thailand migration report stated there were 150,707 expats in Thailand of which 72,969 were retirees, personally I don't think thats too far a stretch to take on district by district, with the added bonus of flushing out the illegals. Or of course they only have to tie it to visa extensions and wait for the 150,707 to come to them.
I agree completely, as sure as eggs are eggs the agent route will get shut down sooner or later. Thailand are always mentioning wanting a 'better class' of higher spending expats, shutting down the agent route, which is essentially people who largely cannot afford to live here, will acheive that. Someone will notice that soon imo
So essentially your advice is to hope you don't come onto the radar, so we've gone full circle back to dangerous advice in my opinion. Especially when possible deportation for tax avoidance becomes a real thing
So they won't know you're in the country from your passport? visa? 90 day reporting? People all over the world try to hide from the taxman, rarely ends well