Gmail reads all your mails and by joining, you agree that they can use the content of your mail for advertising purposes. Gmail is not fit for security purposes if you have a business and don't want to share your content with people you don't know.
If you are a tax resident, you will have to declare money, if you don't you will most likely have a problem when need you a visa with money requirements.
You need to work:
Qualification of applicant for humanitarian reasons in each circumstance: 3.3.1 Spouse: To provide patronage or to be under patronage of a Thai national spouse 1) The patronage provider works in Thailand
Notification of Immigration Commission
I am not commenting on the OP but on your invalid comment that the Thai banks are way behind.
You are right about the bankbook part but their ATM's have been a lot smarter (more functionality) than the Western ATM's decades ago.
If you do a bank transfer online with Bangkok bank, you get a message in red: check the recipient name.
Thai systems aren't years behind. In Thailand you could use an ATM to send money to another person's account decades ago.