KH, LA & MM were my three non-sea options left after the MY-TH border closed in mid/late MAR 2020.
Unfortunately for me, shortly thereafter all three countries closed their borders on Thailand like domino chips falling.
So I was "stuck" in TH until late SEP 2020, because I liked TH and was not homesick enough to go home.
Do tell about KH. How long did KH's free visa extension/amnesty last? Were tourists in KH played like us headless chickens in TH? What is the current visa situation for tourists still stuck in KH? Have you read/heard of stories of foreigners who were given permission to enter KH after its borders were closed? Etc.
From my experiences dealing with Thai Immigration, I will say that Samut Sakhon IO has been the most helpful and provided the best services thus far.
The two young officers (guy and lady) who tried to help me, spoke perfect English and were pro-active in giving me pertinent information. The man even offered to give me his mobile number to help and guide me, after I told him that MTT had run out of appointment slots for visa extension back in late September.
When I finally made my decision, in front of him, to save all the trouble and leave Thailand the following day, the man had the presence of mind to tell me that he was sure I would soon come back to Thailand.
IOs, that's how it's done. Courtesy. Care. Working beyond the call of duty. Exploring all available options. In short, professionalism with plenty of sympathy.
If you need to apply for a COVID tourist visa extension and are not beholden to the IO in your jurisdiction, by all means visit Samut Sakhon IO.
Samut Sakhon IO can be seen on the left side of Thanon Ekkachai shortly after crossing the provincial border coming from Bangkok. I am sure buses run regularly along Thanon Ekkachai. Plus, the railway to that world-renowned, well-rehearsed patchwork trainride market passes nearby, as shown on Google Map.
Thai officials, many of whom still have some Chinese blood in them, love tourists from China. Who are usually honest spenders and ethical followers of Confucian/Buddhist teachings.
Plus, which business doesn't love Chinese money nowadays?
It is easy money for Thailand, given up nonchalantly by the nouveaux-riches from China who enjoy the warmth and exoticness of Thailand while still feeling at ease in a culture reminding them of home.
I still don't know why you were fined. For a tourist to remain at his stated residence for the entirety of stay in Thailand defeats the purpose of touring.
I was curious, because I was visiting and staying at a different location almost every day while traveling on a bicycle.