@Brandon ***********
your statement above is incorrect.
I am not sure you understand parts of the LTR visa Aplication process for foreign employees sponsored by a foreign company ("Work from Thailand Professionals"); because the sponsor must provide evidence and reporting about the corporate revenue or stock exchange status.
1.1) There are many foreign companies that have satisfied the financial threshold to sponsor foreign employees in Thailand on the LTR visa.
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Our Thai law firm has assisted circa +25 in the last couple of months; inclduing the ongoing compliance requirements & reporting obligations.
1.2) Accepted that wealthy private individuals or certain professionals, which do not have a foreign employer shall have a different application & threshold route. But that is not applicable to the OP's fact-pattern; so irrelevant.
2) In regard to foreign Branches/ Representative offices & Trading Offices - again - the Thai Ministry of Commerce / DBD & Revenue department check with the Immigration before authorisation by the Labor department to issue the work permit.
3) If a LTR visa holder ends the employment contract it shall directly affect the foreigner's visa status and the guidance is that the sponsor should notify the relevant Thai authorities.