Yes it’s the property owners responsibility to report foreigners staying at their property. Some do. Some don’t. If you need interaction with immigration then you can normally do so on their behalf with documentation from them.
Different offices have different requirements to do so if you are trying to do it yourself without them present.
The onus is on them to do it. Via the online system it takes them possibly 3 minutes to do.
Completely the other way around. In person they generally wouldn’t let you get to the payment stage if you hadn’t got everything right to start with.
With the evisa system once you’ve paid that’s it. Sure they may ask you for extra documentation but if you have mis-typed something like your first or last name or similar your application will be rejected and you will lose the application fee.
Whoa. What? Where did that come from? Who mentioned anything about seasoning? No one ever.
No one knows what any requirements will be but I can’t see seasoning funds in a Thai account being one of them. As a DTV holder there has never been a requirement to have funds in a Thai bank.
Some embassies or consulates may require to to have the funds in your bank account for 3-6 months to apply for the visa but once you have the visa then you can do what you want with those funds.