Well, most of them aren't private. So, that doesn't work either.
Of course they are. Private in this context means non-sovereign.
In the context of cryptocurrency, "private" can mean a lot of things.
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Earlier quoted context omitted.
Which is why cash back cards are very nice. Because your points are a static amount of cash that you should regularly convert.
You can get more if you are willing to deal with the points. For example, Chase will give you 3 points per dollar on some cards on some categories, and Amex will give you 4. Those points can be >$0.01 each transferring to airline miles (or in the case of Chase $0.015 "paying yourself back" for restaurants). No card will give you 4.5% cash back on restaurants.