If the funds were of legit origin then proving how they came to you isn't an︁ issue. You simply show proof of the company sales / services wherever is applicable. (In︂ its simplest explanation).
If you are living in a country which doesn't tax on foreign︃ income then why bring it into the country (or at least all of it, as︄ I believe in paying taxes)? There are then lots of additional layers you can create︅ to suit you and your lifestyle, I like transferring it to a crypto card (obviously︆ not based in that country) for stable coin returns etc. Each to their own.
Interested as to what you mean here sorry? As I feel I may be missing︈ something. Flag theory isn't a site, it's a definition of a way of life /︉ life structure / life & financial structure etc. It's a strategy that has been around︊ since countries existed but someone happened to coin the term a century or so ago.︋ So I'd imagine there are many if not hundreds of sites that offer flag theory︌ type services.