100 million baht in 2 years? So about $1.5m USD in a year.
That's not exactly "staggering" or significant in the context of the Bitcoin network. Unlikely that such operations have any meaningful control over the network or liquidity, even if it's just 1% of what's known.
You seem to think that these sorts of operations are somehow connected in a large coordinated cartel the controls the industry, but given that they're illegal, isn't it far more likely that these "black market" operators are fairly small by comparison to the legitimate players in the US?
The mining ban in China a couple of years back gave us a pretty good indication of the size of the legitimate industry in that country, and it absolutely DWARFS the biggest of the illegal examples you gave.
Interesting way to word it too, "illegal mining". They're just stealing electricity. If they used that stolen electricity for heating, you wouldn't call it "illegal heating", would you?