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Probably because unethical jeweler’s can claim that those diamonds are natural when they resell. Just a thought

I can answer your first: Oregon opal is common opal, what is called potch in Australia. It's opaque so the matrix cannot be seen within. The potch is mostly taken off Australian opals, usually just a little is left to provide a background colour. The matrix, being a different material from potch will expand at a different rate than the opal as it warms/cools causing it to crack.

People who say that Ethiopian opal is superior to Australian opal are likely either expressing their personal preference or trying to market or sell you Ethiopian opal. Same with the people who say that Australian opal is superior. There are beautiful opals from several different places in the world. It’s entirely subjective. Now if you are talking about prices, then Australia has produced the most pricey opals in the world so far. That’s simply an objective fact…so far. What really sets me off is when people who sell Australian opal denigrate Ethiopian opal because Ethiopian opal absorbs liquids. Who looks at a gemstone and thinks "That’s just a waste of money because it absorbs liquids." Ethiopian opal has to be cared for correctly just like you have to care for pearls, but how many people would ever badmouth pearl jewelry because it requires a bit more care? It’s nonsense marketing used to protect the Australian opal market from the high quality and much more affordable Ethiopian opals that have hit the market over the past decade.

Ethiopian opal absorbs water simply due to the porous nature of the material, it is generally noted to have a lower specific gravity "is less dense" than other types of opal. The porous nature of Ethiopian opals can cause issues if the stone is exposed to wetting and drying cycles, sometimes leading to the loss of play-of-colour, and, I would personally be inclined to warn people to avoid any prolonged heat exposure as the stone could dry out causing it to become more brittle, or, extreme cold as any water trapped within may expand as it freezes causing the opal to crack apart. All opals can be negatively impacted by temperature extremes, not just Ethiopian opals, however, due to the porous nature of the Ethiopian opals, the stones are significantly less stable in these circumstances.

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Try not to get too hung up on typos, or at least try not to be smug when offering a correction. Making informative videos like this one takes a lot of work. As far as your claim that Australian opals can’t be treated, that’s not entirely true. A lot of matrix opals are in fact treatable and usually are treated. For instance, most Andamooka Matrix is treated with sugar and acid to darken the matrix in order to create high contrast with the precious opal contained throughout the matrix. So while it’s true that smoke treating and dying most varieties of Australian opal is not possible, you can’t make the sweeping generalization that Australian opal can’t be treated, and you definitely shouldn’t make claims that anyone who is told Australian opal has been treated is being lied to.