For those seeking tourist visas in Phnom Penh, I just came back from Thai Embassy and several people in front of me were denied for not being able to show the 20 thousand THB req. I was not seeking a TR visa, so I have no further details, but just a heads up.
P.s. In the snippets of conversation I overheard, they appeared to want bank statements.
TLDR : Answer Summary
Recent visitors to the Thai Embassy in Phnom Penh report that applicants for tourist visas may be denied if they cannot show proof of funds, typically 20,000 THB in cash or equivalent currency. Bank statements are required for the visa application, while immigration officers may demand cash upon arrival at the airport. Although experiences vary, and some have successfully shown digital bank balances instead of cash, it's advisable to be prepared with both bank statements and cash to avoid complications.