one utuber actually had an assistant? PM for external affairs or something similar. He said he had participated in many of the ongoing meetings around new immigration policies. He also said it is "unlimited" but of course completely at the discretion of the immigration agent at the boarder, when you come through; that is for boarder runs. he said there's nothing specific written in the law, so it's up to each agent... but of course that's always subject to change with no notice.
people who get the ltv for very rich people have to submit a lot more similar documents showing their millions. Not like that info is going to be on social media. Also many countries have a dual tax agreement with thailand and within that is agreement between your country and thailand they agree to share financial and other information if required. You can google us thailand dual tax agreement and it's right there... other countries going to be the same. That's just worried about nothing.
If you want to use an agent, you should already be in Thailand for this type of service. Also very helpful if you say what area of Thailand you're going to be in, as agents are local to a city/prov and each immigration office can have somewhat different rules. Many things currently in the process of being updated/changed. Some things reported to be official and published in the coming week... for me I'm waiting for the official announcements vs news speculation. Hopefully mostly positive improvements coming