Everyone says you dumb for not reading the requirements. But it's a good question. Because everyone doesn't realize that embassies can add random requirements at the spot if they want to.
In my case , I applied for the DTV in Taiwan category medical treatment. And being rich was not enough for them. I had to show what my job was . So I showed them my crypto portfolio and trades and told them I was an investor.
I do invest in crypto and luckily I had many transactions coming in and out so it was easy to prove. Not sure I would have been approved without showing that though
I insisted on the DTV visa for 5 minutes. Showing their website and asking them why they put the DTV visa requirements for medical treatment so detailed on the website.
I can speak Thai. They were very suspicious of all DTV appliers category medical treatment. So I overheard them say they called the clinic and everything was fine in my case. However others were interrogated for 5-10 minutes. That's why they also asked us for additional documents/information regarding job and salary.