Citizens shouldn't need to check the status of each company they do business with. That would be too much work for individual in the real world to ever do it.
If you're going to make that argument, then please don't bring the real world into it, because in the real world, figuring out whom to trust and whom not to, is something everyone already does.
I'm not really saying we shouldn't have a common set of protections; nobody is going to say "I'm pro-fraud." But we really do disagree on how low the bar can be, what risks (and expenses to insure against risks) are acceptable, and so on. And in the real world, everything is about risks, not absolute protections. One company uses a VISA merchant account, another just has a paypal account. Who are you to say one of them is wrong to accept Paypal's offer (or that both are wrong, since the company should just be waiting for checks (or cash) in the mail)?
People don't even know what the common set of rules is. I just assumed it was illegal for credit card companies to sell to third parties, information about what products I buy, but no. Go next door in one direction, and you'll find someone who is astonished that I could be so naive. Go next door from there, and you'll find someone else who still doesn't know, and is equally astonished for for the opposite reason.
Every time you see a piece of paper with a shitload of fine print, you are looking at direct evidence that nobody is satisfied that the lines are in the right places, and everyone is doing something about it, by sending out that fine print or by continuing to do business with the people who sent it to them.
You can build regulated structures out of unregulated primitives.
Experience says you can't.
You've had some unique experiences, then. Dollars themselves used to built out of less-regulated gold. Western Union, credit cards, and other more complicated (and more "rulesey") things were built out of dollars. Paypal, complete with its frustrating freezes (suddenly labeled "over-regulation" or "private regulation" by those burned), was built on credit cards and bank accounts. Your experience doesn't include any of this? (Or to call up my previous analogy, CPython and its wonderful garbage collection, is built atop C.)
And Bitcoin certainly isn't regulated.
Exactly. It's not, and it probably won't ever be (unless governments persuade people to adopt some blockchain policy changes). Yet, in the news today, Singapore says it intends to regulate Bitcoin exchanges within their jurisdiction. That's what I mean about building regulated things upon unregulated primatives. You might not understand Bitcoin, but if a government were to tell you that a particular Bitcoin escrow had that government's full faith and backing, then you might be willing to use that escrow, even if the funds were stored as Bitcoin. At the same time, there would be people out there, possibly having fun with Bitcoin and doing business with each other using that currency, without ever using that exchange and getting themselves stuck in the regulations.
Just like what happens with dollars.