No one knows the answer to this since it's only been a few months. I think the only time you would have to prove something or show evidence is if you do your extension after 6 months at your local immigration office. There is always a chance that an immigration officer at the border could check, it's within his right, but very unlinkely.
yeah could be. I find the biggest question asked here is about the funds...which I thought would be the easiest. I realise it's not easy for everyone but I consider it an emergency fund and I think everyone should have at least 6 months of emergency funds in case something goes bottoms up with your online work. Or, transfer from investments to your account and then visit an embassy that doesn't require 6months of statements perhaps.
My question would be, if you work remotely why not get the DTV under that category - it would be way cheaper than paying for a soft power activity , don't you think? But yes, as long as you are not working in Thailand all is ok (meaning your income is earned from outside of Thailand).
The digital nomad visa doesn't require you to pay for some crazy expensive course. Further to that, what happens when your course is over? We don't know if there will be checks on that but the digital nomad category, if you already work online, is preferable for those reasons.
In reality, there are 2 options : Digital nomad / freelancer OR soft power (muay thai / cooking, etc...). If you have the money in the bank and work remote, go for the digital nomad option.
yeah, outside embassies do not accept Baht. They have their own price in their own currency unless its SE Asia most of them quote in USD. I think that Laos accepts 10,000 baht so they are probably the "cheapest" but Vietnam is $340.